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Old 07-19-2016, 02:30 PM
linde21 linde21 is offline
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Default OSPF accept adv-rtr question

I have inherited the configuration of some Avaya 48xx switches running OSPF. It appears that an attempt was made to only allow router LSAs (or redistributed connected routes) from the specific interface IPs of our Layer 3 Avaya switches by using the ip ospf adv-rtr command. For example:

accept adv-rtr 10.200.200.1
accept adv-rtr 10.200.200.1 enable
accept adv-rtr 10.200.200.3
accept adv-rtr 10.200.200.3 enable
accept adv-rtr 10.200.200.4
accept adv-rtr 10.200.200.4 enable
accept adv-rtr 10.200.200.5
accept adv-rtr 10.200.200.5 enable

I don't believe that these commands are actually doing anything as the "Advertising Router" for the LSAs uses the "Router ID" of the routers, not the IP Addresses of the interfaces.

For Example:

Area ID Type Link State ID Advertising Rtr

10.0.0.0 Rtr 10.125.25.201 10.125.25.201
10.0.0.0 Rtr 10.125.35.201 10.125.35.201
10.0.0.0 Net 10.200.200.1 10.125.35.201

show ip ospf accept

Advertising Router Metric Type Enabled Policy Name
------------------ ----------- ------- --------------
10.200.200.1 Any True
10.200.200.3 Any True
10.200.200.4 Any True
10.200.200.5 Any True

I feel that if the intent was to apply some sort of policy to control which types of routes were injected into the area only from our specific Layer 3 switches, an actual Router ID should have been used instead of the Interface IP of what is a Brouter port on the Layer 3 Avaya switches. Am I thinking this through correctly?

Sincerely,

Shane
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