Flooding LSA Headers to Neighbors

Once two routers hear Hellos, and the parameter check passes, they do not immediately send packets holding the LSAs. Instead, each router creates and sends Database Description (DD, or sometimes called DBD) packets, which contain the headers of each LSA. The headers include enough information to uni...

Steady-State Operation and the State Refresh Message

As mentioned briefly earlier in the chapter, with PIM-DM, an interface stays pruned only for 3 minutes by default. Prune messages list a particular source and group (in other words, a particular (S,G) SPT). Whenever a router receives a Prune message, it finds the matching (S,G) SPT entry and marks t...

GP/MPLS Graceful Restart Operation

This section describes the operation of the BGP with an MPLS graceful restart mechanism using the network shown in Figure 7-11. The following discussion assumes that LSR1 and LSR2 are capable of both BGP with MPLS graceful restart and NSF. The following sequence of steps does not necessarily indicat...

Implementing Banners

The following commands configure various types of banners on a router: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#banner exec  # This is an exec banner # Router1(config)#banner login # This is a login banner # Router1(co...

Route Redistribution

First, we will show an example of redistributing from OSPF into RIPv6: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#ipv6 router rip RIP_PROC Router1(config-rtr)#redistribute ospf 1 metric 5 Router1(config-rtr)#exit Router...

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