debug ospf event | Display information on |
| such as adjacencies, flooding information, |
| designated router selection, and SPF |
| calculation. |
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debug ospf ism [events status timers] | Display flooding information, SPF calculation |
| on internal |
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debug ospf lsa [flooding refresh] | Display flooding information, SPF calculation |
| on |
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debug ospf nsm [events status timers] | Display information on adjacencies. |
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debug ospf nssa | Display OSPF NSSA information. |
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show debugging ospf | Display |
5.8 Virtual Router Redundancy Protocol (VRRP)
Virtual Router Redundancy Protocol (VRRP) specifies a protocol that dynamically elects a gateway router from among virtual routers running VRRP on a LAN. VRRP enables a group of routers to form a single virtual router. The LAN hosts can then be configured with the virtual router as their default gateway. The virtual router, representing a group of routers, is also known as a VRRP group identified by Virtual Router Identity (VRID). This allows hosts to maintain access to other networks without requiring configuration of dynamic routing or router discovery protocols on every
5.8.1 VRRP Configuration
All VRRP configuration commands are provided within the interface configuration mode.
| authentication | Enable authentication | ||
| description | Set virtual router description | ||
| ip | Set the IP Address | ||
| preempt | Enable preempt mode | ||
| priority | Set priority to specified VRID | ||
| timers | VRRP Timers |
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| Command |
| Purpose | |
| ip vrrp VRID ip A.B.C.D | Enables VRRP on an interface and identifies the |
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| primary IP address of the virtual router. |
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| ip vrrp VRID description text | Assigns a text description to the VRRP VRID group. |
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| ip vrrp VRID preempt |
| Configures the router to take over as master virtual | |
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| router for a VRRP VRID group if it has a higher priority |
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| than the current master virtual router. This command is |
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| enabled by default. |
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| ip vrrp VRID priority level | Sets the priority level of the router within a VRRP VRID |
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| group. The default value is 100. |
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| ip vrrp VRID timers [advertise | Configures the interval between successive |
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| interval] |
| advertisements by the master virtual router in a VRRP |
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| VRID group. |
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| ip vrrp VRID authentication string | Authenticates VRRP packets received from other |
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| routers in the VRID group. If you configure |
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| authentication, all routers within the VRRP VRID group |
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| must use the same authentication string. |
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