Design Reference

Figure 21: Avoiding excessive ICMP redirect messages without SMLT
Open Shortest Path First
Use OSPF to ensure that the switch can communicate with other OSPF routers. This section
describes some general design considerations and presents a number of design scenarios for
OSPF.
For more information about OSPF concepts and configuration, see Avaya Virtual Services Platform
4000 Series Configuration — OSPF and RIP, NN46251-506.
OSPF LSA limits
To determine OSPF link-state advertisement (LSA) limits:
1.
Use the command show ip ospf area to determine the LSA_CNT and to obtain the
number of LSAs for a given area.
2.
Use the following formula to determine the number of areas. Ensure the total is less than
16,000 (16K):
N = 1 to the number of areas for each switch
Adj
N
= number of adjacencies for each Area N
LSA_CNT
N
= number of LSAs for each Area N
For example, assume that a switch has a configuration of three areas with a total of 18 adjacencies
and 1000 routes. This includes:
• 3 adjacencies with an LSA_CNT of 500 (Area 1)
•
10 adjacencies with an LSA_CNT of 1000 (Area 2)
Open Shortest Path First
January 2015 Network Design Reference for Avaya VSP 4000 Series 61
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