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Configuring DECnet Services

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308619-14.00 Rev 00

Static Adjacency Support

The Nortel Networks routing software for DECnet services creates and maintains

its adjacency database by periodically broadcasting Hello messages to its

neighbors. In DECnet terminology, an adjacency is a directly connected

circuit-neighbor pair toward which packets are forwarded by the router (a

neighbor is an adjacent host). The neighbor can be a Level 1 or Level 2 router, or

an end node.

The Nortel Networks routing software for DECnet services allows you to

configure static adjacencies for the Nortel Networks router. Static adjacencies

specify the DECnet and data link layer address of the neighbor, and the circuit

used to reach the neighbor.

Unless a static adjacency is explicitly deleted from the system, it remains in the

router’s adjacency database -- even if the router never receives Hello messages

from the adjacent host. Thus, by configuring static adjacencies and disabling

Hello message generation, you reduce Hello message traffic between the router

and its neighbors.

For example, DECnet Routers A and B reside in the same area (Figure 1-8

Figure 1-8. Static Adjacencies Defined for Routers Residing in the

Same Area

The only network information that the routers need to exchange is Level 1

topology information. To reduce traffic overhead, do the following:

• Configure a static adjacency for interface S1 that specifies its neighbor --

interface S2 on Router B.

Note:

Static adjacencies are recommended over wide area network lines to

help reduce overhead traffic. Static adjacencies are not recommended over

local area network connections, because if a remote node is removed from the

network, the local router does not recognize the topology change.

Area ID

6 bits

10 bits

Node ID

DEC0001A

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