Ospf Scaling Guidelines - Avaya 8800 Planning And Engineering

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OSPF scaling guidelines

• OSPF design guidelines
• OSPF and CPU utilization
• OSPF network design examples
OSPF scaling guidelines
For information about OSPF scaling numbers, see
page 27 and Avaya Ethernet Routing Switch 8800/8600 Release Notes, NN46205-402. The
Release Notes take precedence over this document.
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
2. Use the following formula to determine the number of areas. Ensure the total is less
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)
• 5 adjacencies with an LSA_CNT of 200 (Area 3)
Calculate the number as follows:
3*500+10*1000+5*200=12.5K < 40K
This configuration ensures that the switch operates within accepted scalability limits.
Planning and Engineering — Network Design
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the number of LSAs for a given area.
than 40K:
N = 1 to the number of areas per switch
Adj = number of adjacencies per Area N
N
LSA_CNT = number of LSAs per Area N
N
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Table 5: Supported scaling capabilities
Open Shortest Path First
on
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