Open Shortest Path First; Ospf Scaling Guidelines - Avaya 8800 Planning And Engineering, Network Design

Limitations
IPv6 BGP convergence in case of SMLT scenarios cannot be guaranteed. Avaya does not
recommend to configure BGP peers between SMLT core routers or in between the core router and
any switch connecting through SMLT links for the failover scenarios.

Open Shortest Path First

Use Open Shortest Path First to ensure that the switch can communicate with other OSPF-speaking
routers. This section describes some general design considerations and presents a number of
design scenarios for OSPF.
For more information about OSPF and a list of OSPF commands see Avaya Ethernet Routing
Switch 8800/8600 Configuration — OSPF and RIP, NN46205-522.
OSPF navigation
•

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 29 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 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
40K:
N = 1 to the number of areas per switch
Adj = number of adjacencies per Area N
N
LSA_CNT
N
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= number of LSAs per Area N
Planning and Engineering — Network Design
Comments on this document? infodev@avaya.com
Table 5: Supported scaling capabilities
Open Shortest Path First
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