Be cautious not to rely on a show ip bgp sum many IOS versions (I don't remember specifically) have a bug that makes that number inaccurate. Most of the tools I have seen have basically done a show ip bgp collected the whole table and parsed it. I know I wrote a tool like that when I was a wcom. As for tracking update packets/sec vs prefixes updated/sec, one of the juniper trace options I think flag update, gives a summary of how many prefixes were updated. -----Original Message----- From: Paul Donner [mailto:pdonner@cisco.com] Sent: Friday, August 23, 2002 2:52 PM To: Ezequiel Carson; Dr. Mosh Cc: nanog@merit.edu Subject: Re: Measuring BGP routes I believe there is pointer a screen-scraper script at the route-views web site that might give you this and more info you are looking for. Don't have the info right now but if you can't find it ping me and I'll dig it up. At 12:18 PM 8/23/2002, Ezequiel Carson wrote:
Hi,
I have tried to search this some time ago ,but i have never found it.
I have seen that there is a updates/seconds.
If you want to get numbrer of prefixes you could use rsh and write a simple perl/shell script.
Ezequiel
On Thu, 2002-08-22 at 20:07, Dr. Mosh wrote:
Wonder if anyone of you have come across the need for this.
I'm basically looking for a Cisco IOS MIB that tells me the number of BGP routes a router currently has, for graphing purposes to keep track over time.
Anyone know the mib handy?
Thanks private reply works
-- -------------- http://www.zeromemory.com - metal for your ears.
On Fri, 2002-08-23 at 15:05, Frank Scalzo wrote: *edited for length*
Most of the tools I have seen have basically done a show ip bgp collected the whole table and parsed it. I know I wrote a tool like that
Is there any reason this is preferable to establishing an eBGP multihop session with the box and receiving the information by that means? -- Jeff S Wheeler <jsw@five-elements.com>
On 23 Aug 2002, Jeff S Wheeler wrote:
On Fri, 2002-08-23 at 15:05, Frank Scalzo wrote: *edited for length*
Most of the tools I have seen have basically done a show ip bgp collected the whole table and parsed it. I know I wrote a tool like that
Is there any reason this is preferable to establishing an eBGP multihop session with the box and receiving the information by that means?
Yes. BGP only passes along the best route. 'show ip bgp' gives you all routes. Unless, of course, your vendor supports something like Juniper's "advertise-inactive". Bradley
Bradley Dunn wrote:
On 23 Aug 2002, Jeff S Wheeler wrote:
On Fri, 2002-08-23 at 15:05, Frank Scalzo wrote: *edited for length*
Most of the tools I have seen have basically done a show ip bgp collected the whole table and parsed it. I know I wrote a tool like that
Is there any reason this is preferable to establishing an eBGP multihop session with the box and receiving the information by that means?
Yes.
BGP only passes along the best route. 'show ip bgp' gives you all routes. Unless, of course, your vendor supports something like Juniper's "advertise-inactive".
Actually, BGP will give all routes in the peering session (assuming no filtering, yada, yada). It won't give you all paths though (subject to your cavaet above). So depending on which you are looking for, the peering session idea might be fine. ========== bep
Bradley et al, FYI, the "advertise-inactive" feature was (at least until very recently) a documentation bug. See the message included below from John Allen at Junper. Cheers, Nick ------------------ Jennifer, I just filed a doc-bug for this. Our documentation reads, "By default, BGP stores the route information it receives from update messages in the JUNOS routing table, and the routing table exports only active routes into BGP, which BGP then advertises to its peers. To have the routing table export to BGP all routes learned by BGP even if the JUNOS software did not select them to be active routes, include the advertise-inactive statement." However, this is not correct. Sorry for the spam ;) -John -----Original Message----- From: Jennifer Rexford Sent: Wednesday, June 26, 2002 4:28 PM To: John Allen Subject: Re: Question on slide from "Controlling the Impact of BGP Policy Changes on IP Traffic" John,
One of our customers was at Nanog and caught your presentation. They are interested in the slide on page 11 and the bullet point "Juniper support for outputting a feed of all BGP routes." I'm not clear from the context what feature you might have been referring to. Would you mind clarifying?
We were referring to the "advertise-inactive" feature described at http://www.juniper.net/techpubs/software/junos42/swconfig-routing42/html /bgp-config38.html#1015169 This is nice for getting a live feed of all of the routes advertised by the eBGP neighbors of an operational router. -- Jen On Fri, Aug 23, 2002 at 12:40:56PM -0700, Bradley Dunn wrote:
On 23 Aug 2002, Jeff S Wheeler wrote:
On Fri, 2002-08-23 at 15:05, Frank Scalzo wrote: *edited for length*
Most of the tools I have seen have basically done a show ip bgp collected the whole table and parsed it. I know I wrote a tool like that
Is there any reason this is preferable to establishing an eBGP multihop session with the box and receiving the information by that means?
Yes.
BGP only passes along the best route. 'show ip bgp' gives you all routes. Unless, of course, your vendor supports something like Juniper's "advertise-inactive".
Bradley
participants (5)
-
Bradley Dunn -
Bruce Pinsky -
Frank Scalzo -
Jeff S Wheeler -
Nick Feamster