用英语介绍一种食物 线上等··不用太长 60词左右好了例文是这样的Mustard is a food.It has a history of 3000 years.The French have it with beef.Americans like it in hamburgers and sandwiches.The mustard palnt has bright yellows.……怎么老没人回答捏··崩溃ing - -
生曰快樂_0410
苹果 I know something about apple.I like apple very much,because first it is very beautiful.It is red and round.You can not help eatin second,it is very sweet.It is rally a kind of enjoyme third,it is said that apple is very good for your health.There is a proverb said ‘ one apple a day,keeps doctor away.It means that if you have one apple everyday,you won’t get any disease.Amazing!Right?You see,apple is not just a ordinary fruit.It can also keep you away from disease,so there is no reason to refuse such good fruit.Try it and enjoy it!我想谈谈苹果.我非常喜欢苹果.首先,因为它长得非常好看,又红又圆.看到它的时候你会经不住想咬一口.其次,品尝苹果的时候真的是一件很享受的事情.再次,苹果有益身体健康.俗话说的好,一日一苹果,医生远离你.要是就是说,如果你一天吃一个苹果,你就不会生病.很神奇,对吧?看到了吧,苹果不仅仅只是一种普通的水果,它还能让你远离疾病,没有什么理由去拒绝这么好的水果.去品尝下吧,享受这份美好.
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扫描下载二维码The starsThere are millions of stars in the sky.If you look (6) ______the sky on a clear night,it is possible to see about 3000 stars.They look small,but they are really (7) ______ big hot balls of burning gas.Some of them are huge,but others are much smaller,like our planet Earth.The biggest stars are very bright,but they only live for a short time.Every day new stars (8) ______ born and old stars die.All the stars are very far away.The light from the nearest star takes more (9) ______ four years to reach Earth.Hundreds of years ago,people (10) ______ stars,like the North star,to know which direction to travel in.Today you can still see that star.6.A at B up C on7.A very B too C much 8.A is B be C are9.A that B of C than10.A use B used C using
A ：look at看 look up查找 look on貌似不存在,只有look down on轻视A ：much后面加名词 too放进去句意不通C ：stars是复数形式C ：more than固定搭配,比...多=overB ：hungreds of years ago是明显的过去式的时间短语,要用过去式...ago都用过去式
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扫描下载二维码Cisco Nexus 3000 Series NX-OS Interfaces Configuration Guide, Release 6.x
- Configuring Layer 3 Interfaces [Cisco Nexus 3000 Series Switches] - Cisco
Cisco Nexus 3000 Series NX-OS Interfaces Configuration Guide, Release 6.x
Book Contents
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Book Title
Cisco Nexus 3000 Series NX-OS Interfaces Configuration Guide, Release 6.x
Chapter Title
Configuring Layer 3 Interfaces
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Chapter: Configuring Layer 3 Interfaces
Chapter Contents
Configuring Layer 3 InterfacesThis chapter contains the following sections:
Information About Layer 3 Interfaces
Layer 3 interfaces forward packets to another device using static or dynamic routing protocols. You can use Layer 3 interfaces for IP routing and inter-VLAN routing of Layer 2 traffic.
Interfaces
You can configure a
port as a Layer 2 interface or a Layer 3 interface. A routed interface is a
physical port that can route IP traffic to another device. A routed interface
is a Layer 3 interface only and does not support Layer 2 protocols, such as the
Spanning Tree Protocol (STP).
All Ethernet ports are Layer 2 (switchports)
by default. You can change this default behavior using the
no switchport
command from interface configuration mode. To change multiple ports at one
time, you can specify a range of interfaces and then apply the
no switchport
You can assign an IP
address to the port, enable routing, and assign routing protocol
characteristics to this routed interface.
You can assign a
static MAC address to a Layer 3 interface.
default MAC address for a Layer 3 interface is the MAC address of the virtual
device context (VDC) that is associated with it. You can change the default MAC
address of the Layer 3 interface by using the
mac-address command from the interface
configuration mode. A static MAC address can be configured on SVI, Layer 3
interfaces, port channels, Layer 3 subinterfaces, and tunnel interfaces. You
can also configure static MAC addresses on a range of ports and port channels.
However, all ports must be in Layer 3. Even if one port in the range of ports
is in Layer 2, the command is rejected and an error message appears.
For information on configuring MAC addresses, see the Layer 2 Switching
Configuration Guide for your device.
You can also create a
Layer 3 port channel from routed interfaces.
Routed interfaces and
subinterfaces support exponentially decayed rate counters. Cisco NX-OS tracks
the following statistics with these averaging counters:
Input packets/sec
Output packets/sec
Input bytes/sec
Output bytes/sec
Subinterfaces
You can create virtual subinterfaces on a parent interface configured as a Layer 3 interface. A parent interface can be a physical port or a port channel.
Subinterfaces divide the parent interface into two or more virtual interfaces on which you can assign unique Layer 3 parameters such as IP addresses and dynamic routing protocols. The IP address for each subinterface should be in a different subnet from any other subinterface on the parent interface.
You create a subinterface with a name that consists of the parent interface name (for example, Ethernet 2/1) followed by a period and then by a number that is unique for that subinterface. For example, you could create a subinterface for Ethernet interface 2/1 named Ethernet 2/1.1 where .1 indicates the subinterface.
Cisco NX-OS enables subinterfaces when the parent interface is enabled. You can shut down a subinterface independent of shutting down the parent interface. If you shut down the parent interface, Cisco NX-OS shuts down all associated subinterfaces as well.
One use of subinterfaces is to provide unique Layer 3 interfaces to each VLAN that is
supported by the parent interface. In this scenario, the parent interface connects to a Layer 2 trunking port on another device. You configure a subinterface and associate the subinterface to a VLAN ID using 802.1Q trunking.
The following figure shows a trunking port from a switch that connects to router B on interface E 2/1. This interface contains three subinterfaces that are associated with each of the three VLANs that are carried by the trunking port.
Figure 1. Subinterfaces for VLANs
Interfaces
A VLAN interface or a
switch virtual interface (SVI) is a virtual routed interface that connects a
VLAN on the device to the Layer 3 router engine on the same device. Only one
VLAN interface can be associated with a VLAN, but you need to configure a VLAN
interface for a VLAN only when you want to route between VLANs or to provide IP
host connectivity to the device through a virtual routing and forwarding (VRF)
instance that is not the management VRF. When you enable VLAN interface
creation, Cisco NX-OS creates a VLAN interface for the default VLAN (VLAN 1) to
permit remote switch administration.
You must enable the
VLAN network interface feature before you can configure it. The system
automatically takes a checkpoint prior to disabling the feature, and you can
roll back to this checkpoint. For information about rollbacks and checkpoints,
see the System Management Configuration Guide for your device.
You cannot delete
the VLAN interface for VLAN 1.
You can route across
VLAN interfaces to provide Layer 3 inter-VLAN routing by configuring a VLAN
interface for each VLAN that you want to route traffic to and assigning an IP
address on the VLAN interface. For more information on IP addresses and IP
routing, see the Unicast Routing Configuration Guide for your device.
The following figure
shows two hosts connected to two VLANs on a device. You can configure VLAN
interfaces for each VLAN that allows Host 1 to communicate with Host 2 using IP
routing between the VLANs. VLAN 1 communicates at Layer 3 over VLAN interface
1and VLAN 10 communicates at Layer 3 over VLAN interface 10.
Figure 2. Connecting Two
VLANs with VLAN Interfaces
Loopback Interfaces
A loopback interface is a virtual interface with a single endpoint that is always up. Any packet that is transmitted
over a loopback interface is immediately received by this interface. Loopback interfaces emulate a physical interface.
You can use loopback interfaces for performance analysis, testing, and local communications. Loopback interfaces can act as a termination address for routing protocol sessions. This loopback configuration allows routing protocol sessions to stay up even if some of the outbound interfaces are down.
Tunnel Interfaces
Cisco NX-OS supports tunnel interfaces as IP tunnels. IP tunnels can encapsulate a same- layer or higher layer protocol and transport the result over IP through a tunnel that is created between two routers.
Licensing Requirements for Layer 3 Interfaces
This feature does not require a license. Any feature not included in a license package is bundled with the Cisco NX-OS system images and is provided at no extra charge to you. For a complete explanation of the Cisco NX-OS licensing scheme, see the Cisco NX-OS Licensing Guide.
Guidelines and
Limitations for Layer 3 Interfaces
Layer 3 interfaces
have the following configuration guidelines and limitations:
If you change a
Layer 3 interface to a Layer 2 interface, Cisco NX-OS shuts down the interface,
reenables the interface, and removes all configuration specific to Layer 3.
If you change a
Layer 2 interface to a Layer 3 interface, Cisco NX-OS shuts down the interface,
reenables the interface, and deletes all configuration specific to Layer 2.
Cisco Nexus 3016
will punt multicast Layer 2 traffic to the CPU if the Layer 3 MTU is not the
same for all Layer 3 interfaces, and if the MTU QoS was changed to jumbo. All
Layer 3 interfaces must have the same Layer 3 MTU to avoid this issue.
Default Settings for Layer 3 Interfaces
The default setting for the Layer 3 Admin state is Shut.
SVI Autostate
The SVI Autostate Disable feature
enables the Switch Virtual Interface (SVI) to be in the “up” state even if no
interface is in the “up” state in the corresponding VLAN.
An SVI is also a virtual routed interface that connects a VLAN on the
device to the Layer 3 router engine on the same device. The ports in a VLAN
determine the operational state of the corresponding SVI. An SVI interface on a
VLAN comes “up” when at least one port in the corresponding VLAN is in the
Spanning Tree Protocol (STP) forwarding state. Similarly, the SVI interface
goes “down” when the last STP forwarding port goes down or to any other state.
This characteristic of SVI is called 'Autostate'.
You can create SVIs to define Layer 2 or Layer 3 boundaries on VLANs, or
use the SVI interface to manage devices. In the second scenario, the SVI
Autostate Disable feature ensures that the SVI interface is in the “up” state even
if no interface is in the “up” state in the corresponding VLAN.
DHCP Client
Cisco NX-OS Release
6.0(2)U3(1) introduced DHCP client discovery on SVIs. Cisco NX-OS Release
6.0(2)U4(1) adds DHCP client discovery support for IPv6 addresses and physical
Ethernet and management interfaces. You can configure the IP address of a DHCP
client by using the
ip address dhcp
ipv6 address
dhcp command. These commands sends a request from the DHCP client
to the DHCP server soliciting an IPv4 or IPv6 address from the DHCP server. The
DHCP client on the Cisco Nexus switch identifies itself to the DHCP server. The
DHCP server uses this identifier to send the IP address back to the DHCP
When a DHCP client is
configured on the SVI with the DHCP server sending router and DNS options, the
ip route 0.0.0.0/0
router-ip and
ip name-server
dns-ip commands are configured on the switch
automatically.
If the switch is
reloaded and, at the same time, the router and DNS options are disabled on the
server side, after the switch comes up, a new IP address is assigned to the
SVI. However, the stale
command and
ip name-server
command will still exist in the switch configuration. You must manually remove
these commands from the configuration.
Limitations for
Using DHCP Client Discovery on Interfaces
The following are the
limitations for using DHCP client discovery on interfaces:
This feature is
supported only on physical Ethernet interfaces, management interfaces, and
Starting with
Cisco NX-OS Release 6.0(2)U4(1), this feature is supported on non-default
virtual routing and forwarding (VRF) instances as well.
The DNS server and
default router option-related configurations are saved in the startup
configuration when you enter the
copy running-config
startup-config command. When you reload the switch, if this
configuration is not applicable, you might have to remove it.
You can configure
a maximum of six DNS servers on the switch, which is a switch limitation. This
maximum number includes the DNS servers configured by the DHCP client and the
DNS servers configured manually.
If the number of
DNS servers configured on the switch is more than six, and if you get a DHCP
offer for an SVI with DNS option set, the IP address is not assigned to the
MAC-Embedded IPv6
Beginning with Cisco
NX-OS Release 6.0(2)U4(1), BGP allows an IPv4 prefix to be carried over an IPv6
next-hop. The IPv6 next-hop is leveraged to remove neighbor discovery (ND)
related traffic from the network. To do this, the MAC address is embedded in
the IPv6 address. Such an address is called a MAC Embedded IPv6 (MEv6) address.
The router extracts the MAC address directly from the MEv6 address instead of
going through ND. Local interface and next-hop MAC addresses are extracted from
the IPv6 addresses.
On MEv6-enabled IPv6
interfaces, the same MEv6 extracted MAC address is used for IPv4 traffic as
well. MEv6 is supported on all Layer 3 capable interfaces except SVIs.
Important:
When MEv6 is enabled on an interface, ping6 to the IPv6 link local
address, OSPFv3, and BFDv6 are not supported on that interface.
Configuring Layer 3 InterfacesConfiguring a Routed Interface
Procedure Command or ActionPurposeStep 1switch# configure terminal
Enters global configuration mode.
Step 2switch(config)# interface ethernet slot/port
Enters interface configuration mode.
Step 3switch(conifg-if)# no switchport
Configures the interface as a Layer 3 interface and deletes any configuration specific to Layer 2 on this interface.
To convert a Layer 3 interface back into a Layer 2 interface, use the switchport command.
Step 4switch(config-if)# [ip|ipv6]ip-address/length
Configures an IP
address for this interface.
Step 5switch(config-if)# medium {broadcast | p2p}
(Optional) Configures the interface medium as either point to point or broadcast.
The default setting is broadcast, and this setting does not appear in any of the show commands. However, if you do change the setting to p2p, you will see this setting when you enter the show running-config command.
Step 6switch(config-if)# show interfaces
(Optional) Displays the Layer 3 interface statistics.
Step 7switch(config-if)#
copy running-config
startup-config
(Optional)
Saves the change
persistently through reboots and restarts by copying the running configuration
to the startup configuration.
This example shows how to configure an IPv4-routed Layer 3 interface:
switch# configure terminal
switch(config)# interface ethernet 2/1
switch(config-if)# no switchport
switch(config-if)# ip address 192.0.2.1/8
switch(config-if)# copy running-config startup-config
Configuring a Subinterface
Before You BeginConfigure the parent interface as a routed interface.
Create the port-channel interface if you want to create a subinterface on that port channel.
Procedure Command or ActionPurposeStep 1switch(config-if)#
copy running-config
startup-config
(Optional)
Saves the change
persistently through reboots and restarts by copying the running configuration
to the startup configuration.
Step 2switch(config)# interface ethernet slot/port.number
Enters interface configuration mode. The range for the slot is from 1 to 255. The range for the port is from 1 to 128.
Step 3switch(config-if)# [ip | ipv6] address ip-address/length
Configures an IP
address for this interface.
Step 4switch(config-if)# encapsulation dot1Q vlan-id
Configures IEEE 802.1Q VLAN encapsulation on the subinterface. The range for the vlan-id is from 2 to 4093.
Step 5switch(config-if)# show interfaces
(Optional) Displays the Layer 3 interface statistics.
Step 6switch(config-if)#
copy running-config
startup-config
(Optional)
Saves the change
persistently through reboots and restarts by copying the running configuration
to the startup configuration.
This example shows how to create a subinterface:
switch# configure terminal
switch(config)# interface ethernet 2/1
switch(config-if)# ip address 192.0.2.1/8
switch(config-if)# encapsulation dot1Q 33
switch(config-if)# copy running-config startup-config
Configuring the Bandwidth on an Interface
You can configure the bandwidth for a routed interface, port channel, or subinterface.
Procedure Command or ActionPurposeStep 1switch#
Enters global
configuration mode.
Step 2switch(config)# interface ethernet slot/port
Enters interface configuration mode. The range for the slot is from 1 to 255. The range for the port is from 1 to 128.
Step 3switch(conifg-if)# bandwidth [value | inherit [value]]
Configures the bandwidth parameter for a routed
interface, port channel, or subinterface, as follows:value—Size of the bandwidth in kilobytes. The range is from 1 to .
inherit—Indicates that
all subinterfaces of this interface inherit either the bandwidth value (if a value is specified) or the bandwidth of the parent interface (if a value is not specified).
Step 4switch(config-if)#
copy running-config
startup-config
(Optional)
Saves the change
persistently through reboots and restarts by copying the running configuration
to the startup configuration.
This example shows how to configure Ethernet interface 2/1 with a bandwidth
value of 80000:
switch# configure terminal
switch(config)# interface ethernet 2/1
switch(config-if)# bandwidth 80000
switch(config-if)# copy running-config startup-config
Configuring a VLAN Interface
Procedure Command or ActionPurposeStep 1switch#
Enters global
configuration mode.
Step 2switch(config)# feature interface-vlan
Enables VLAN interface mode.
Step 3switch(config)# interface vlan number
Creates a VLAN interface. The number range is from 1 to 4094.
Step 4switch(config-if)# [ip | ipv6 ] address ip-address/length
Configures an IP
address for this interface.
Step 5switch(config-if)# no shutdown
Brings the interface up administratively.
Step 6switch(config-if)# show interface vlan number
(Optional) Displays the VLAN interface statistics. The number range is from 1 to 4094.
Step 7switch(config-if)#
copy running-config
startup-config
(Optional)
Saves the change
persistently through reboots and restarts by copying the running configuration
to the startup configuration.
This example shows how to create a VLAN interface:
switch# configure terminal
switch(config)# feature interface-vlan
switch(config)# interface vlan 10
switch(config-if)# ip address 192.0.2.1/8
switch(config-if)# copy running-config startup-config
Configuring a Loopback Interface
Before You Begin
Ensure that the IP address of the loopback interface is unique across all routers on the network.
Procedure Command or ActionPurposeStep 1switch# configure terminal
Enters global configuration mode.
Step 2switch(config)# interface loopback instance
Creates a loopback interface. The instance range is from 0 to 1023.
Step 3switch(config-if)# [ip | ipv6 ] address ip-address/length
Configures an IP
address for this interface.
Step 4switch(config-if)# show interface loopback instance
(Optional) Displays the loopback interface statistics. The instance range is from 0 to 1023.
Step 5switch(config-if)#
copy running-config
startup-config
(Optional)
Saves the change
persistently through reboots and restarts by copying the running configuration
to the startup configuration.
This example shows how to create a loopback interface:
switch# configure terminal
switch(config)# interface loopback 0
switch(config-if)# ip address 192.0.2.100/8
switch(config-if)# copy running-config startup-config
Assigning an
Interface to a VRF
Before You Begin
Assign the IP address for
a tunnel interface after you have configured the interface for a VRF.
Procedure Command or ActionPurposeStep 1switch#
Enters global
configuration mode.
Step 2switch(config)#
interface-typenumber
Enters interface
configuration mode.
Step 3switch(conifg-if)#vrf member vrf-name
interface to a VRF.
Step 4switch(config-if)#
ipv6]ip-address/length
Configures an IP
address for this interface. You must do this step after you assign this
interface to a VRF.
Step 5switch(config-if)#
vrf [vrf-name]
interface-type
(Optional)
Displays VRF
information.
Step 6switch(config-if)#
show interfaces
(Optional)
Displays the
Layer 3 interface statistics.
Step 7switch(config-if)#
copy running-config
startup-config
(Optional)
Saves the change
persistently through reboots and restarts by copying the running configuration
to the startup configuration.
This example shows
how to add a Layer 3 interface to the VRF:
switch# configure terminal
switch(config)# interface loopback 0
switch(config-if)# vrf member RemoteOfficeVRF
switch(config-if)# ip address 209.0.2.1/16
switch(config-if)# copy running-config startup-config
Configuring an
Interface MAC Address
You can configure a
static MAC address on SVI, Layer 3 interfaces, port channels, Layer 3
subinterfaces, and tunnel interfaces. You can also configure static MAC
addresses on a range of ports and port channels. However, all ports must be in
Layer 3. Even if one port in the range of ports is in Layer 2, the command is
rejected and an error message appears.
Procedure Command or ActionPurposeStep 1switch#
Enters global
configuration mode.
Step 2switch(config)#
interface ethernet
interface configuration mode.
Step 3switch(config-if)#
mac-address
router MAC address
Configures the
interface MAC address. The
no form removes
the configuration. You can enter the MAC address in any one of the four
supported formats:
EE-EE-EE-EE-EE-EE
EE:EE:EE:EE:EE:EE
EEEE.EEEE.EEEE
Do not enter any
of the following invalid MAC addresses:
address—00
Broadcast MAC
address—FFFF.FFFF.FFFF
Multicast MAC
address—0100.DAAA.ADDD
Step 4switch(config-if)#
show interface ethernet
(Optional)
Displays all information for the interface.
This example shows
how to configure an interface MAC address:
switch# configure terminal
switch(config)# interface ethernet 3/3
switch(config-if)# mac-address aaaa.bbbb.dddd
switch(config-if)# show interface ethernet 3/3
switch(config-if)#
Configuring a
MAC-Embedded IPv6 Address
Procedure Command or ActionPurposeStep 1switch#
Enters global
configuration mode.
Step 2switch(config)#
Enters the
interface configuration mode for the specified interface.
Step 3switch(config-if)#
no switchport
Configures the
interface as a Layer 3 interface and deletes any configuration specific to
Layer 2 on this interface.
To convert a
Layer 3 interface back into a Layer 2 interface, use the
switchport
Step 4switch(config-if)#
mac-address
ipv6-extract
Extracts the
MAC address embedded in the IPv6 address configured on the interface.
The MEv6 configuration is currently not supported with the
EUI-64 format of IPv6 address.
Step 5switch(config-if)#
ipv6 address
ip-address/length
Configures an
IPv6 address for this interface.
Step 6switch(config-if)#
mac-extract [exclude nud-phase]
Extracts the
next-hop MAC address embedded in a next-hop IPv6 address.
nud-phase option blocks packets during the ND phase only. When
nud-phase option is not specified, packets are blocked during
both ND and Neighbor Unreachability Detection (NUD) phases.
Step 7 switch(config)#
show ipv6 icmp
(Optional)
Displays IPv6
Internet Control Message Protocol version 6 (ICMPv6) interface information.
This example shows
how to configure a MAC-embedded IPv6 address with ND mac-extract enabled:
switch# configure terminal
Enter configuration commands, one per line.
End with CNTL/Z.
switch(config)# interface ethernet 1/3
switch(config-if)# no switchport
switch(config-if)# mac-address ipv6-extract
switch(config-if)# ipv6 address /64
switch(config-if)# ipv6 nd mac-extract
switch(config-if)# show ipv6 icmp interface ethernet 1/3
ICMPv6 Interfaces for VRF "default"
Ethernet1/3, Interface status: protocol-up/link-up/admin-up
IPv6 address:
IPv6 subnet:
2002:1::/64
IPv6 interface DAD state:
ND mac-extract : Enabled
ICMPv6 active timers:
Last Neighbor-Solicitation sent: 00:01:39
Last Neighbor-Advertisement sent: 00:01:40
Last Router-Advertisement sent: 00:01:41
Next Router-Advertisement sent in: 00:03:34
Router-Advertisement parameters:
Periodic interval: 200 to 600 seconds
Send "Managed Address Configuration" flag: false
Send "Other Stateful Configuration" flag: false
Send "Current Hop Limit" field: 64
Send "MTU" option value: 1500
Send "Router Lifetime" field: 1800 secs
Send "Reachable Time" field: 0 ms
Send "Retrans Timer" field: 0 ms
Suppress RA: Disabled
Suppress MTU in RA: Disabled
Neighbor-Solicitation parameters:
NS retransmit interval: 1000 ms
ICMPv6 error message parameters:
Send redirects: true
Send unreachables: false
ICMPv6-nd Statisitcs (sent/received):
RAs: 3/0, RSs: 0/0, NAs: 2/0, NSs: 7/0, RDs: 0/0
Interface statistics last reset: never
switch(config)#
This example shows
how to configure a MAC-embedded IPv6 address with ND mac-extract (excluding NUD
phase) enabled:
switch# configure terminal
Enter configuration commands, one per line.
End with CNTL/Z.
switch(config)# interface ethernet 1/5
switch(config-if)# no switchport
switch(config-if)# mac-address ipv6-extract
switch(config-if)# ipv6 address /64
switch(config-if)# ipv6 nd mac-extract exclude nud-phase
switch(config-if)# show ipv6 icmp interface ethernet 1/5
ICMPv6 Interfaces for VRF "default"
Ethernet1/5, Interface status: protocol-up/link-up/admin-up
IPv6 address:
IPv6 subnet:
2002:2::/64
IPv6 interface DAD state:
ND mac-extract : Enabled (Excluding NUD Phase)
ICMPv6 active timers:
Last Neighbor-Solicitation sent: 00:06:45
Last Neighbor-Advertisement sent: 00:06:46
Last Router-Advertisement sent: 00:02:18
Next Router-Advertisement sent in: 00:02:24
Router-Advertisement parameters:
Periodic interval: 200 to 600 seconds
Send "Managed Address Configuration" flag: false
Send "Other Stateful Configuration" flag: false
Send "Current Hop Limit" field: 64
Send "MTU" option value: 1500
Send "Router Lifetime" field: 1800 secs
Send "Reachable Time" field: 0 ms
Send "Retrans Timer" field: 0 ms
Suppress RA: Disabled
Suppress MTU in RA: Disabled
Neighbor-Solicitation parameters:
NS retransmit interval: 1000 ms
ICMPv6 error message parameters:
Send redirects: true
Send unreachables: false
ICMPv6-nd Statisitcs (sent/received):
RAs: 6/0, RSs: 0/0, NAs: 2/0, NSs: 7/0, RDs: 0/0
Interface statistics last reset: never
switch(config-if)#
Configuring SVI
Autostate Disable
You can configure a SVI to remain
active even if no interfaces are up in the corresponding VLAN. This enhancement
is called Autostate Disable.
Procedure Command or ActionPurposeStep 1switch#
Enters global
configuration mode.
Step 2switch(config)#
system default interface-vlan autostate
Reenables the system default autostate behavior on Switching
Virtual Interface (SVI) in a VLAN. Use the no form of the command to disable
the autostate behavior on SVI.
Step 3 switch(config)#
feature interface-vlan
Enables the creation of VLAN interfaces SVI.
Step 4switch(config)#
interface vlan
Disables the VLAN interface and enters interface configuration
Step 5(config-if)#
Disables the default autostate behavior of SVIs on the VLAN
interface.
Step 6(config-if)#
Returns to privileged EXEC mode.
Step 7show running-config interface vlan
(Optional) Displays the running configuration for a specific port channel.
This example shows how to
configure the SVI Autostate Disable feature:
switch# configure terminal
switch(config)# system default interface-vlan autostate
switch(config)# feature interface-vlan
switch(config)# interface vlan 2
switch(config-if)# no autostate
switch(config-if)# end
Configuring a DHCP
Client on an Interface
You can configure
the IP address of a DHCP client on an SVI, a management interface, or a
physical Ethernet interface.
Procedure Command or ActionPurposeStep 1switch#
Enters global
configuration mode.
Step 2 switch(config)#
slot/port |
mgmt-interface-number |
physical Ethernet interface, a management interface, or a VLAN interface.
The range of
vlan id is from
1 to 4094.
switch(config-if)#
ipv6 address
Requests the
DHCP server for an IPv4 or IPv6 address.
no form of this command removes any address that
was acquired.
Step 4switch(config)#
copy running-config
startup-config
(Optional)
Saves the change
persistently through reboots and restarts by copying the running configuration
to the startup configuration.
This example shows
how to configure the IP address of a DHCP client on an SVI:
switch# configure terminal
switch(config)# interface vlan 15
switch(config-if)# ip address dhcp
This example shows
how to configure an IPv6 address of a DHCP client on a management interface:
switch# configure terminal
switch(config)# interface mgmt 0
switch(config-if)# ipv6 address dhcp
Verifying the Layer
3 Interfaces Configuration
Use one of the following commands to verify the configuration:
Triggering the Layer
3 Interface Consistency Checker
You can manually
trigger the Layer 3 interface consistency checker to compare the hardware and
software configuration of all physical interfaces in a module and display the
results. To manually trigger the Layer 3 Interface consistency checker and
display the results, use the following command in any mode:
Procedure Command or ActionPurposeStep 1show consistency-checker l3-interface module
Starts the Layer
3 interface consistency check on all Layer 3 physical interfaces of a module
that are up and displays its results.
This example shows
how to trigger the Layer 3 interface consistency check and display its results:
switch# show consistency-checker l3-interface module 1
L3 LIF Checks: L3 Vlan, CML Flags, IPv4 Enable
Consistency Check: PASSED
No inconsistencies found for:
Ethernet1/17
Ethernet1/49
Ethernet1/50
Monitoring Layer 3
Interfaces
Use one of the following commands to display statistics about the feature:
Configuration
Examples for Layer 3 Interfaces
This example shows
how to configure Ethernet subinterfaces:
switch# configuration terminal
switch(config)# interface ethernet 2/1.10
switch(config-if)# description Layer 3 for VLAN 10
switch(config-if)# encapsulation dot1q 10
switch(config-if)# ip address 192.0.2.1/8
switch(config-if)# copy running-config startup-config
This example shows
how to configure a VLAN interface:
switch# configuration terminal
switch(config)# interface vlan 100
switch(config-if)# no switchport
switch(config-if)# ipv6 address 33:0DB::2/8
switch(config-if)# copy running-config startup-config
This example shows how to
configure Switching Virtual Interface (SVI) Autostate Disable:
switch# configure terminal
switch(config)# system default interface-vlan autostate
switch(config)# feature interface-vlan
switch(config)# interface vlan 2
switch(config-if)# no autostate
switch(config-if)# end
switch# show running-config interface vlan 2
This example shows
how to configure a loopback interface:
switch# configuration terminal
switch(config)# interface loopback 3
switch(config-if)# no switchport
switch(config-if)# ip address 192.0.2.2/32
switch(config-if)# copy running-config startup-config
example shows how to configure the three sample load intervals for an Ethernet
switch# configure terminal
switch(config)# interface ethernet 1/3
switch(config-if)# load-interval counter 1 5
switch(config-if)# load-interval counter 2 135
switch(config-if)# load-interval counter 3 225
switch(config-if)#
Related Documents for Layer 3 Interfaces
Related Topics
Document Title
MIBs for Layer 3 Interfaces
Standards for Layer 3 Interfaces
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.
Feature History for Layer 3 Interfaces
Feature Name
Feature Information
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