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Configuring DECnet Services
1-16
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
- Configuring DECnet Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- Before You Begin 11
- Text Conventions 12
- Acronyms 13
- Hard-Copy Technical Manuals 14
- How to Get Help 15
- Chapter 1 17
- DECnet Overview 17
- DECnet Phase V Organization 19
- The Routing Process 21
- The Designated Router 25
- DECnet IV to V Transition 26
- Translating Data Packets 27
- Phase IV to Phase V 28
- Phase V to Phase IV 28
- Advertising Routes 29
- 308619-14.00 Rev 00 30
- Static Routes 31
- Static Adjacency Support 32
- Different Areas 33
- For More Information 34
- Chapter 2 35
- Enabling DECnet Services 35
- Caution: 36
- Chapter 3 39
- Editing DECnet Parameters 39
- Accessing DECnet Parameters 40
- Configuring Static Routes 56
- Deleting a Static Route 61
- Adding a Static Adjacency 62
- Click on Add 64
- Deleting a Static Adjacency 68
- Appendix A 73
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