Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Cisco BGP Case Study #5 - Simple Question

Hello all - I'm missing something here - but I'll ask anyway... :)

Take a look at the BGP Case Studies (Case#5, Practical Design Example) at:

Watch the wrap.

http://www.cisco.com/en/US/tech/tk648/tk365/technologies_tech_note09186a00800c95bb.shtml#example

In the beginning of the case study, I am assuming synchronization is on as the author asks us to turn it off in the next few pages.

My issue: Take a look at the first "show ip bgp" for RTB in case study #5.

Notice this network:

Network Next Hop Metric LocPrf Weight Path

*>i203.250.13.0 203.250.13.41 0 100 0 i

Given that this route is learned via iBGP and

we see the > notation, doesn't this suggest

that the route is synchronized with an

IGP route?

Yet, since this is an ospf route originating

from a loopback interface from RTA, it will

be advertised as a /32 in OSPF.

This is where I get confused. Can BGP

report that a route is synchronized, best

and valid if there isn't a corresponding

route with the exact same prefix in the

IGP table assuming synchronization is on?

Am I missing something here?

TIA!

Scott

ps - Sorry to ask this questions again.

1 REPLY
New Member

Re: Cisco BGP Case Study #5 - Simple Question

No bgp can not send out a route that is not nailed down. It can summarize a route with others

389
Views
0
Helpful
1
Replies
CreatePlease to create content