Hunt,
When you do the show ip bgp command - it shows you a lot of information on
the top (status codes, origin code etc etc...). The status code "*"
indicates that it is one of the valid paths and ">" indicates that it is the
best path. Hope this helps.
Also, I found a lot of excellent information on BGP that I recommend to
everyone I know (besides Halabi's book). Here is the link for that
information
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ics/icsbgp4.htm. Check it
out, it starts with basics and gives you good information on BGP along with
the configuration.
Take care
Raj :)
"Hunt Lee" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Thanks for the explanation guys :) Just one more quick question, on the
> "show ip bgp",
> are the best routes indicated by an > or an *?
>
> Regards,
> Hunt Lee
>
>
> Howard C. Berkowitz wrote:
>
> > >Can anyone please explain to me what is the difference between the
> > >command "show ip bgp" (or show ip bgp summary) and "show ip route bgp"?
> > >I have read the BSCN book between page 348 and 352 many times, but I'm
> > >still very confused. The book said "show ip bgp" displays BGP routing
> > >table?? But I thought that should be "show ip route bgp". Please help.
> > >
> > >Regards,
> > >Hunt Lee
> > >IP Solution Analyst
> > >Cable and Wireless
> >
> > You are dealing with two tables, at the very least. Some are
> > conceptual or stored as part of other tables. Let me work through
> > the flow.
> >
> > Incoming BGP updates, before filtering, go into the Adj-RIB-In
> >
> > After filtering, which is primarily on a per-peer basis, the
> > remaining updates go into a BGP-only table called the Loc-RIB. This
> > table contains all the BGP potential routes that passed acceptance
> > filtering, and is router-wide. It also indicates which are the
> > "best" BGP routes to a given destingation.
> >
> > "show ip bgp" displays the Loc-RIB.
> >
> > Next, all "best" routes from the Loc-RIB are sent to the main IP
> > routing table, where they compete with potential routes from all
> > other sources. "show ip route" shows the active routes to all
> > destinations. "show ip route bgp" shows the subset of those routes
> > that was learned from BGP.
> >
> > An example:
> >
> > BGP has two routes to 172.16.1.0/24 and to 172.16.2.0/24.
> > It picks a best route to each. Let's say that has a next hop of
> > 192.168.1.1
> > Show ip bgp would show all four, with an asterisk on the two best.
> >
> > The two 172.16.1.0/24 and 172.16.2.0/24 routes, with a next hop of
> > 192.168.1.1,
> > are sent to the main routing table installation process.
> >
> > Assume that the router also has a static route with administrative
> > distance 1 to 172.16.2.0/24. That has equal specificity to the second
> > BGP route, but the administrative distance is more preferred.
> >
> > When you do a "show ip route", you will see routes to both
> > destination, but with a static source to 172.16.2.0 and a BGP source
> > for 172.16.1.0.
> >
> > If you do a "show ip route bgp", you will only see the route to
> > 172.16.1.0, because that is the only active route with a BGP source.
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