From: ccie preparation (ccie22@gmail.com)
Date: Mon Dec 29 2008 - 19:49:48 ARST
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
>>
>>
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>>
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