From: shiran guez (shiranp3@gmail.com)
Date: Mon Dec 29 2008 - 19:53:17 ARST
space
On Mon, Dec 29, 2008 at 11:49 PM, ccie preparation <ccie22@gmail.com> wrote:
> Jason,
> Many thanks! you are awesome!
> More more clarrification.
>
> ^4_[0-9]*$
>
> In this what does the "_" mean?
>
> Thanks,
> Atul
>
> On Mon, Dec 29, 2008 at 12:44 PM, Jason Madsen <madsen.jason@gmail.com>
> wrote:
> > Hi Atul,
> >
> > It appears you answered your own question...or at least the answer to
> your
> > question was in your email. _100$ defines / matches any routes that were
> > orginated / advertised in AS 100 (e.g. 300 200 100). ^100.* defines /
> > matches routes that passed through AS 100 to yours (e.g. 100 200 300); AS
> > 100 is directly connected to yours. Actually, because of the .* It
> would
> > be any directly connected AS that begins with the number 100 e.g. 1000,
> > 1001, 1002, 100.
> >
> > show ip bgp will show you what routes, if any, you're learning via BGP.
> It
> > will also show you what AS the routes were originated in and traversed
> > through to get to your AS. The AS number listed all the way to the right
> is
> > the originating AS (xxx$). The AS all the way to the left is the
> neighbor
> > AS that your AS is connected to and is receiving routes from (^xxx).
> >
> > Try setting up a BGP scenario in which you have multiple AS's, advertise
> > routes in each of them, and then do a show ip bgp and also play around
> with
> > various show ip bgp regex xxx commands, where "xxx" is replaced with a
> > regular expression. There are at least a couple of places in the Doc CD
> > that discuss regex. Here are a couple:
> >
> > IOS --> 12.4 --> Terminal Services --> Appendixes --> Regular Expressions
> > IOS --> 12.4 --> Config Fundamentals --> Understanding the CLI -->
> Regular
> > Expressions
> >
> > Jason
> >
> > On Mon, Dec 29, 2008 at 1:09 PM, ccie preparation <ccie22@gmail.com>
> wrote:
> >>
> >> Folks,
> >> Can someone tell me the difference between the two.
> >>
> >> _100$This expression indicates an origin of AS100.
> >>
> >> ^100 .*This expression indicates transmission from AS100.
> >>
> >> Thanks,
> >> Atul
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >> _______________________________________________________________________
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>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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>
>
>
>
>
>
>
>
-- Shiran Guez MCSE CCNP NCE1 JNCIA-ER CCIE #20572 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3Blogs and organic groups at http://www.ccie.net
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