OSPFv3 LSA Types

OSPFv3 and OSPFv2 use a similar set of LSAs, with some differences. Table 21-2 lists the  OSPFv3 LSAs, including the LSA function code, which indicates the function of the LSA.  Table 21-2. OSPFv3 LSAs Note      The LSA link-state (LS) type is created b...

Establishing Adjacencies on a Broadcast Link

On broadcast links, each IS receives packets sent by the DIS, minimizing the amount of traffic that needs to be generated to maintain the adjacencies and databases. The DIS has the responsibility of flooding the LSPs to all connected systems running Integrated IS-IS. The adjacencies with the other r...

Troubleshooting Dial-on-Demand Routing (DDR) Issues in IGRP

Dial-on-demand routing is very common when the ISDN or similar dialup links are used as a backup link. When the primary link goes down, this backup link comes up. IGRP starts sending and receiving updates on this link as long as the primary link is down. Two ways exist for using the dialup links...

Catalyst Configuration File Management

For complete system recovery, make sure that you have a copy of each Catalyst's configuration file stored somewhere other than on the Catalyst itself. If anything happens to the Catalyst Supervisor module, you might not be able to recover the configuration file. It is a crime to have to rebuild the ...

EIGRP Authentication Configuration Checklist

The EIGRP authentication configuration process requires several commands, which are summarized as follows: Step 1.    Create an (authentication) key chain: Create the chain and give it a name with the key chain name global command (also puts the user into key chain config mode). T...

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