思科：vrrp配置（vrrp与track配合使用）

思科：vrrp配置（vrrp与track配合使用）

sw1(config-if)#vrrp ?
  <1-255>  Group number
sw1(config-if)#vrrp 1 pri
sw1(config-if)#vrrp 1 priority ?
  <1-254>  Priority level
 

（1）拓扑图

sw1:
interface Vlan1
 ip address 192.168.1.1 255.255.255.0
 vrrp 1 ip 192.168.1.254
 vrrp 1 priority 1
 Vrrp 1 preempt   //启用抢占模式

//在抢占模式下，如果Backup设备的优先级比当前Master设备的优先级高，则主动将自己切换成Master。 
sw2:
interface Vlan1
 ip address 192.168.1.2 255.255.255.0
 vrrp 1 ip 192.168.1.254
 vrrp 1 priority 1
 Vrrp 1 preempt

sw1#show vrrp
Vlan1 - Group 1  
  State is Backup  
  Virtual IP address is 192.168.1.254
  Virtual MAC address is 0000.5e00.0101
  Advertisement interval is 1.000 sec
  Preemption enabled
  Priority is 1   
  Master Router is 192.168.1.2, priority is 1   
  Master Advertisement interval is 1.000 sec
  Master Down interval is 3.996 sec (expires in 3.294 sec)

sw1(config-if)# vrrp 1 priority 254   //优先级数值越大的越优先
sw1(config-if)#
*Aug 11 09:00:29.492: %VRRP-6-STATECHANGE: Vl1 Grp 1 state Backup -> Master
sw1(config-if)#

sw1#show vrrp
Vlan1 - Group 1  
  State is Master  
  Virtual IP address is 192.168.1.254
  Virtual MAC address is 0000.5e00.0101
  Advertisement interval is 1.000 sec
  Preemption enabled
  Priority is 254
  Master Router is 192.168.1.1 (local), priority is 254
  Master Advertisement interval is 1.000 sec
  Master Down interval is 3.007 sec
sw1#

在测试切换时，掉一个包，如下图所示：

可以考虑将vrrp与track配合使用：

sw1:
track 1 interface GigabitEthernet0/1 line-protocol
!
track 2 interface GigabitEthernet0/0 line-protocol
!
interface Vlan1
 ip address 192.168.1.1 255.255.255.0
 vrrp 1 ip 192.168.1.254
 vrrp 1 priority 1
  Vrrp 1 preempt
 vrrp 1 track 1 decrement 2     //#g0/1出现故障的时候，sw1的优先级降低60
 vrrp 1 track 2 decrement 2    //#g0/0出现故障的时候，sw1的优先级降低60
 
 sw2:
track 1 interface GigabitEthernet0/1 line-protocol
!
track 2 interface GigabitEthernet0/0 line-protocol
!
interface Vlan1
 ip address 192.168.1.2 255.255.255.0
 vrrp 1 ip 192.168.1.254
 vrrp 1 priority 1
  Vrrp 1 preempt
 vrrp 1 track 1 decrement 2     //#g0/1出现故障的时候，sw1的优先级降低60
 vrrp 1 track 2 decrement 2    //#g0/0出现故障的时候，sw1的优先级降低60

VRRP、HSRP（列表、list、全）vrrplist、hsrplist
http://www.zh-cjh.com/wenzhangguilei/1583.html
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