BGP配置例子

　　

　　 CAT 1

　　CAT1> (enable) show running-config

　　begin

　　!

　　# ***** NON-DEFAULT CONFIGURATION *****

　　!

　　!

　　#version 6.3(5)

　　!

　　#system

　　set system name CAT1

　　set system highavailability enable

　　!-- Enables high availability on Catalyst switch.

　　!

　　#vtp

　　set vtp domain cisco

　　set vlan 1 name default type ethernet mtu 1500 said 100001 state active

　　[..]

　　set vlan 10,20

　　!

　　#set boot command

　　set boot config-register 0x2102

　　set boot system flash bootflash:cat6000-sup.6-3-5.bin

　　!

　　#module 3 : 48-port 10/100BaseTX Ethernet

　　set vlan 10 3/2

　　!-- Port 3/2 is connected to AS10 on VLAN 10.

　　!

　　#module 5 : 8-port 1000BaseX Ethernet

　　set module name 5

　　set trunk 5/2 on isl 1-1005,1025-4094

　　!-- Port 5/2 is connected to CAT 2 as Trunk.

　　!

　　#module 15 : 1-port Multilayer Switch Feature Card

　　!-- MSFC #1 on Port 1, Mod 15.

　　!

　　#module 16 : 1-port Multilayer Switch Feature Card

　　!-- MSFC #2 on Port 2, Mod 16.

　　

　　

　　

　　

　　

　　CAT 2

　　CAT2 (enable) show running-config

　　begin

　　!

　　# ***** NON-DEFAULT CONFIGURATION *****

　　!

　　!

　　#version 6.3(5)

　　!

　　#system

　　set system name CAT2

　　set system highavailability enable

　　!-- Enables high availability on Catalyst switch.

　　!

　　#vtp

　　set vtp domain cisco

　　set vlan 1 name default type ethernet mtu 1500 said 100001 state active

　　set vlan 10,20

　　!

　　#set boot command

　　set boot config-register 0x2102

　　set boot system flash bootflash:cat6000-sup.6-3-5.bin

　　!

　　!

　　#module 3 : 48-port 10/100BaseTX Ethernet

　　set vlan 20 3/3

　　!-- Port 3/3 is connected to AS20 on VLAN 20.

　　!

　　#module 4 : 8-port 1000BaseX Ethernet

　　set module name 4

　　set trunk 4/2 on isl 1-1005,1025-4094

　　!-- Port 4/2 is connected to CAT 1 as Trunk.

　　!

　　#module 15 : 1-port Multilayer Switch Feature Card

　　!-- MSFC 1 on Port 1, Mod 15.

　　!

　　#module 16 : 1-port Multilayer Switch Feature Card

　　!-- MSFC #2 on Port 2, Mod 16.

　　

　　

　　

　　

　　MSFC Configuration on CAT1

　　CAT1> (enable)

　　CAT1> (enable) session 15

　　Trying Router-15...

　　Connected to Router-15.

　　Escape character is '^]'.

　　

　　MSFC-CAT1>enable

　　MSFC-CAT1#show running-config

　　Building configuration...

　　

　　Current configuration : 868 bytes

　　!

　　version 12.1

　　!

　　hostname MSFC-CAT1

　　!

　　boot system bootflash:c6msfc2-jsv-mz.121-8b.E7

　　!

　　ip subnet-zero

　　!

　　!

　　!

　　redundancy

　　!-- This command enables redundancy.

　　high-availability

　　!-- This command enables high availability.

　　single-router-mode

　　!-- This command enables SRM.

　　!

　　interface Vlan10

　　ip address 192.168.1.1 255.255.255.0

　　!-- Interface Vlan10 is connected to AS10.

　　!

　　interface Vlan20

　　ip address 192.168.2.3 255.255.255.0

　　!-- Interface Vlan20 is connected to interface Vlan20 on CAT2 via the trunk.

　　!

　　router bgp 4

　　no synchronization

　　bgp log-neighbor-changes

　　network 192.168.0.0 mask 255.255.0.0

　　neighbor 192.168.1.2 remote-as 10

　　!-- This command establishes eBGP peering with AS10.

　　neighbor 192.168.2.1 remote-as 4

　　!-- This command establishes iBGP peering with interface VLAN 20 on CAT2.

　　neighbor 192.168.2.1 next-hop-self

　　!-- This command assigns a next-hop value to 192.168.2.3 !-- for updates sent to 192.168.2.1 (the iBGP peer).

　　!

　　ip classless

　　ip route 192.168.0.0 255.255.0.0 Null0

　　

　　

　　

　　

　　MSFC Configuration on CAT2

　　CAT2 (enable)

　　CAT2 (enable) session 15

　　Trying Router-15...

　　Connected to Router-15.

　　Escape character is '^]'.

　　MSFC-CAT2>enable

　　MSFC-CAT2#show running-config

　　Building configuration...

　　

　　Current configuration : 890 bytes

　　!

　　version 12.1

　　!

　　hostname MSFC-CAT2

　　!

　　boot system flash bootflash:c6msfc-jsv-mz.121-8b.E7

　　!

　　ip subnet-zero

　　!

　　!

　　redundancy

　　!-- This command enables redundancy.

　　high-availability

　　!-- This command enables high availability.

　　single-router-mode

　　!-- This command enables SRM.

　　!

　　interface Vlan10

　　ip address 192.168.1.3 255.255.255.0

　　!-- Interface Vlan10 connected to interface Vlan10 on CAT1 via the trunk.

　　!

　　interface Vlan20

　　ip address 192.168.2.1 255.255.255.0

　　!-- Interface Vlan20 connected to AS20.

　　!

　　router bgp 4

　　no synchronization

　　bgp log-neighbor-changes

　　network 192.168.0.0 mask 255.255.0.0

　　neighbor 192.168.2.2 remote-as 20

　　!-- This command establishes eBGP peering with AS20.

　　neighbor 192.168.2.3 remote-as 4

　　!-- This command establishes iBGP peering with interface Vlan20 on CAT1.

　　neighbor 192.168.2.3 next-hop-self

　　!-- This command assigns a next-hop value to 192.168.2.1 !-- for updates sent to 192.168.2.3 (the iBGP peer).

　　!

　　ip classless

　　ip route 192.168.0.0 255.255.0.0 Null0

　　

　　Troubleshoot

　　Now that you've verified the high availability SRM configuration, you need to verify the BGP MSFC on CAT1 and CAT2. Use the show ip bgp summary command to verify the neighbor establishment. The output below confirms successful eBGP and iBGP peering with AS10 and the CAT2 MSFC respectively.

　　

　　MSFC-CAT1#show ip bgp summary

　　BGP router identifier 192.168.2.3, local AS number 4

　　BGP table version is 4, main routing table version 4

　　3 network entries and 4 paths using 435 bytes of memory

　　4 BGP path attribute entries using 240 bytes of memory

　　2 BGP AS-PATH entries using 48 bytes of memory

　　0 BGP route-map cache entries using 0 bytes of memory

　　0 BGP filter-list cache entries using 0 bytes of memory

　　BGP activity 3/14 prefixes, 4/0 paths, scan interval 15 secs

　　

　　Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

　　192.168.1.2 4 10 90 92 4 0 0 01:26:02 1

　　192.168.2.1 4 4 91 91 4 0 0 01:25:38 2

　　Verify the BGP state on the active MSFC in CAT2. The output below confirms successful eBGP and iBGP peering with AS20 and CAT1 respectively

　　MSFC-CAT2#show ip bgp summary

　　BGP router identifier 192.168.2.1, local AS number 4

　　BGP table version is 4, main routing table version 4

　　3 network entries and 4 paths using 435 bytes of memory

　　4 BGP path attribute entries using 240 bytes of memory

　　2 BGP AS-PATH entries using 48 bytes of memory

　　0 BGP route-map cache entries using 0 bytes of memory

　　0 BGP filter-list cache entries using 0 bytes of memory

　　BGP activity 3/0 prefixes, 4/0 paths, scan interval 15 secs

　　

　　Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

　　192.168.2.2 4 20 110 112 4 0 0 01:46:43 1

　　192.168.2.3 4 4 101 101 4 0 0 01:35:09 2

　　

　　

　　In the event the designated MSFC (Mod 15 on CAT1) experiences a failure, the standby MSFC (Mod 16 on CAT1) takes over the role of active MSFC. It is important to understand that with the failure of the designated MSFC and fail over to the non-designated MSFC, packet switching will continue to work wit