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BGP network statement

All,

If I have three interfaces:

int lo1

ip address 172.5.5.5 255.255.255.255

int fa0/0

ip address 192.168.1.1 255.255.255.0

int s1/0

ip address 10.5.5.1 255.255.255.252

Would my network statements in BGP for s1/0 and lo1 look like:

network 10.5.5.0 mask 255.255.255.252

network 172.5.5.5 mask 255.255.255.255

network 192.168.1.0 mask 255.255.255.0

In other words, my masks in bgp should match what's on my interface, right? I know there's exceptions to the rule.

Thanks!

John

HTH, John *** Please rate all useful posts ***
3 REPLIES
Hall of Fame Super Bronze

Re: BGP network statement

Yes, it must match the mask in the routing table.

__

Edison.

Hall of Fame Super Gold

Re: BGP network statement

John

When you use the mask in the BGP network statement then BGP looks into the routing table for a prefix with exactly that mask. So you your BGP mask should match what in on your interface.

HTH

Rick

Cisco Employee

Re: BGP network statement

John,

That is correct. By the way, the mask configured on the network statement for 192.168.1.0 is the default maks for a class C prefix and will therefore not show in the config.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
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