SHOW IP BGP OUTPUT

This post is for show ip bgp output description:

In show ip bgp output, Networks are listed in numerical order, lower to higher. An (*) asterisk indicates it is valid route with proper next-hop. You can see many options in front of route, Below are the meaning of options:

• “s” for Suppressed : BGP knows about this network but this network is not advertised. Since it is part of summarized route.
• “d” for dampened: BGP can stop advertising a network that flaps too often until it is stable for a period of time.
• “h” for history: BGP knows about this network but this network but does not currently have a valid route.
• "r” for rib failure: The route was advertised to BGP but it was not installed in IP routing table, Since it is learned by some other routing protocol with better administrative distance.
• “S” for Stale: Used with nonstop forwarding to indicate that the route is stale and needs to be refreshed when the peer is re-established.

This symbol *> indicates that this route is valid with proper next hop and same time it is accessible.

Next-hop indicates which router is advertising this route and to reach this network you have to reach this next hop router. 0.0.0.0 Indicates this route is originated locally.

Metric indicates MED attribute, if MED value was received with the route, you can see the med in metric column.

Local Pref indicates Local preference which is associated with routes, It is locally significance.

Weight, It’s a BGP attribute.

Path: It will show you AS path associated with route. Reading this path left to right.

Origin of route – i – means ibgp and locally originated , e- external bgp and externally received, ?- means incomplete origin that means the routes are originated by redistribution.

Some other useful commands for verifying and troubleshooting BGP .

Show ip bgp summary

Show ip bgp neighbors address received-routes

Most common issue-

If some time, you can see the routes in routing table but you can’t ping the route. That time you can check the next hop address and verify that the next hop is accessible by IGP.

For any more queries, Plz post comments. I will try to answer…