Dynamips, a 7200, and a full BGP table

Written by jlgaddis on August 7, 2009 – 5:15 am -

I’ve been using dynamips on and off for a while now and always knew it was cool as hell, but this just really impressed me:

c7200# show ip bgp summary
BGP router identifier 192.168.1.201, local AS number 65101
BGP table version is 593019, main routing table version 593019
297882 network entries using 34852194 bytes of memory
297882 path entries using 15489864 bytes of memory
56505/56484 BGP path/bestpath attribute entries using 7006620 bytes of memory
51421 BGP AS-PATH entries using 1620448 bytes of memory
1632 BGP community entries using 107766 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 59076892 total bytes of memory
BGP activity 298425/543 prefixes, 298425/543 paths, scan interval 60 secs

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
192.168.1.81    4 65001  592483     167   593019    0    0 01:19:55   297882

192.168.1.201 is a 7200 running under dynamips, and I just fed it a (nearly) full BGP table.

For the curious, that was the only router I had running under dynamips and the host is a MacBook (10.5.8), with a 2.2GHz Core2Duo and 4GB of RAM.

How fuckin’ cool is that!?

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Tags: , , , , | 8 Comments »

8 Comments to “Dynamips, a 7200, and a full BGP table”

  1. Karsten Says:
    August 7th, 2009 at 3:08 pm

    Cool? Yes! (I cave been running 17 7200s on nearly the same system for MPLS-studies) But don’t be disappointed by the forwarding speed … ;-)

  2. jlgaddis Says:
    August 7th, 2009 at 3:18 pm

    Yeah, I learned that quickly! I have a rack about half full of gear that I usually use, but sometimes it’s easier to quickly do things in dynamips. Last night for some reason I decided to see how many BGP routes a 2621 could handle before it died (about 15000, by the way), then decided to see if I could shove a full BGP table into a router on dynamips. I was really surprised, but it worked!

  3. Chris Says:
    August 7th, 2009 at 7:26 pm

    Very cool! What were you using to feed the routes to the 7200? Were you using arbitrary routes or a dump of the Internet routing table?

  4. Tom Says:
    August 12th, 2009 at 1:50 am

    I’m also interested in how you got the BGP table into the dynamips router. Could you provide some info on that?

  5. arnolditya Says:
    August 19th, 2009 at 9:54 pm

    I’m also interested too in how you got the BGP table into the dynamips router. Could you provide some info on that?

  6. jlgaddis Says:
    August 21st, 2009 at 1:39 am

    Hey everyone,

    The instructions for how to replicate this, as well as a video showing the results, will be published in the morning (in my time zone), about 8 hours from now.

    Be sure to try it out and let me know how it works for you. I think it’s pretty neat that this is even possible!

    -Jeremy

  7. Edward W Says:
    December 18th, 2009 at 2:41 am

    Hi,

    Still waiting for your post on how to replicate the full internet routing table.

  8. jlgaddis Says:
    December 19th, 2009 at 9:29 am

    @Edward,

    You must have missed it somehow, it’s right here: “Getting BGP routes into dynamips (with video)”

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