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Default-originate Vs bgp cluster-id

Dear Netpro!

why we use bgp cluster-id 50000?

When we issues the command neighbor y.y.y.y Default-originate.how we would verify if it works properly?

many 10xs

4 REPLIES
Hall of Fame Super Bronze

Re: Default-originate Vs bgp cluster-id

Information on bgp cluster-id

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hirp_r/rte_bgh1.htm#wp1071366

As for your other question, you can verify you are sending the default route with the command

show ip bgp neighbor y.y.y.y advertise-routes

HTH,

__

Edison.

New Member

Re: Default-originate Vs bgp cluster-id

Hi Edy!

many 10xs

New Member

Re: Default-originate Vs bgp cluster-id

Hi Edy!

I Didn't Find the Default-Route

R6# sh ip bgp neighbors 1.1.167.7 advertised-routes

BGP table version is 5, local router ID is 6.6.6.6

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*>i150.1.1.0/24 1.1.136.3 0 100 0 i

*>i159.1.1.0/24 1.1.136.3 0 100 0 i

Total number of prefixes 2

many 10xs

Re: Default-originate Vs bgp cluster-id

Hi Ali,

The "neighbor default-originate" command differs than the "default-information originate" command, the default route generated via the default-originate command is kind of considered a special case and is not submitted to the outbound route-map and also won't appear in the output of the "show ip bgp neighbors x.x.x.x advertised-routes", below is a summary of BGP default-route cases:

1. default-information originate + redistribute static (or any dynamic routing protocol having the default route - but the route must be present in the routing table using the redistributed protocol).

2. network command "network 0.0.0.0" but must make sure the default route is present in the routing table (most commonly with a static default route to null0 interface, accordingly any destination address that cannot be matched to a more-specific route matches the static route and is dropped).

3. Using the neighbor x.x.x.x default-originate command. This method does not require the presence of the 0.0.0.0/0 network in the routing table of the advertising router (most commonly used in the cases where a default should be sent to some neighbors, but not to others).

BR,

Mohammed Mahmoud.

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