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Peng Hailin 2016-09-01 08:48:54 +08:00
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d34-First-Hop-Redundancy-Protocols.md
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@ -444,14 +444,37 @@ VTP-Server-2(config-if)#exit
<pre>
VTP-Server-1#<b>show standby brief</b>
P indicates configured to preempt.
|
Interface Grp Pri P State Active Standby Virtual IP
Vl172 1 105 Active local 172.16.31.2 172.16.31.254
P indicates configured to preempt.
|
Interface Grp Pri P State Active Standby Virtual IP
Vl172 1 105 Active local 172.16.31.2 172.16.31.254
VTP-Server-2#<b>show standby brief</b>
P indicates configured to preempt.
|
Interface Grp Pri P State Active Standby Virtual IP
Vl172 1 100 Standby local 172.16.31.1 172.16.31.254
P indicates configured to preempt.
|
Interface Grp Pri P State Active Standby Virtual IP
Vl172 1 100 Standby local 172.16.31.1 172.16.31.254
</pre>
基于此种配置，只有在`VTP-Server-1`失效时，`VTP-Server-2`才会成为活动网关。此外，因为没有配置抢占（preemption），那么即使在`VTP-Server-1`重新上线时，就算在该HSRP组中，其比起`VTP-Server-2`有着更高的优先级，它仍然无法强制性地接过活动网关角色。
###HSRP抢占的配置
**Configuring HSRP Preemption**
抢占特性令到某台网关在本身比当前活动网关有着更高优先级时，强制性地接过活动网关的角色。使用命令`standby [number] preempt`命令，来配置HSRP抢占特性。下面的输出，演示了在`VTP-Server-1`上的此项配置：
```
VTP-Server-1(config)#interface vlan172
VTP-Server-1(config-if)#standby 1 preempt
```
这里同样使用命令`show standby [interface [name] |brief]`, 来验证在某个网关上已有配置抢占特性。是通过下面的`show standby brief`命令输出中的“P”字样演示的：
<pre>
VTP-Server-1#show standby brief
P indicates configured to preempt.
|
Interface Grp Pri <b>P</b> State Active Standby Virtual IP
Vl172 1 105 <b>P</b> Active local 172.16.31.2 172.16.31.254
</pre>