OSPFv2 and OSPFv3 Differences

OSPFv3 also differs from OSPFv2 in many ways. The most obvious is that OSPFv3 supports 128-bit prefixes.  OSPFv3 runs directly within IPv6 packets and can co-exist with OSPFv2. The two routing protocols do not exchange information or pay attention to each other in any way (this is referred to a...

Establishing Adjacencies on a Point-to-Point Link

When point-to-point links are used, adjacency occurs after a Hello packet has been received. Next, each side sends a CSNP. The CSNP is a list of all the links held in the linkstate database, which triggers a synchronization of the link-state database on each machine.  Periodic Hellos maintain...

Flooding on Broadcast Networks

Flooding is optimal over the broadcast network when the IS creates a pseudonode. For each pseudonode, a DIS is responsible for creating and updating the pseudonode LSP and for conducting the flooding over the LAN. Unlike OSPF, there is no backup DIS. The DIS sends CSNP every 10 seconds; the LSP is n...

Cisco IS-IS Restart Operation

This section illustrates the operation of the Cisco IS-IS restart mechanism, using the network diagram shown in Figure 5-8. Both R1 and R2 are Cisco IS-IS restart/NSF-capable and are interconnected via point-to-point links. ?    Assume using normal IS-IS procedures, R1 and R2 have ...

Preventing Unwanted Neighbors Using Passive

Interfaces When an EIGRP network configuration subcommand matches an interface, EIGRP on that router does two things: Step 1. Attempts to find potential EIGRP neighbors by sending Hellos to the 224.0.0.10 multicast address Step 2. Advertises about the subnet connected to that interface In some...

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