Solved

BGP community announcement?

Posted on 2011-09-29
1
370 Views
Last Modified: 2013-11-05
Hi,

Realizing that I'm way out of my comfort zone, I had our bandwidth carrier do some troubleshooting for a possible network related issue to and from one of our managed server providers. Having done the troubleshooting end-to-end I wanted to make sure that there isn't any silliness on the BGP routes, etc.

Here is what the network person Above.net mentioned:
" We can have you apply the community 6461:5550  to your route announcements to us for the  209.*.*.*/24 block" ... "The other community that we could use is 6461:5000, which suppress the route to all peers, but I would suggest doing it to just L3 to start."

That being said, on the 6509, do I need to update the appropriate route-map to accomplish this?

Let me know if you need more details.
0
Comment
Question by:wsani
1 Comment
 
LVL 17

Accepted Solution

by:
Garry-G earned 500 total points
ID: 36817228
Yes, setting a BGP community for a prefix works like this (at least on IOS routers, 6500 should be similar):

- set a route-map to a BGP neighbor entry, e.g. "neighbox x.x.x.x route-map myRouteMap"
- on the route-map, do your matching, then set the community for the prefix:

route-map myRouteMap permit 10
  match ip address prefix-list PrefixListToBeTagged
  set community 6461:5500 additive

Open in new window


Instead of the prefix list, you could also use an access list ... that's about all you need to add the community ... then do a "clear ip bgp NEIGHBOR-IP out" to update the outgoing prefixex to your uplink ...
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Port 808 is being blocked 9 63
Monitor bandwidth 3 84
Public IP Address Amazon Servers 2 44
Looking for open port with Telnet 5 33
I recently attended Cisco Live! in Las Vegas, a conference that boasted over 28,000 techies in attendance, and a week of hands-on learning hosted by a solid partner with which Concerto goes to market.  Every year, Cisco displays cutting-edge technol…
Use of TCL script on Cisco devices:  - create file and merge it with running configuration to apply configuration changes
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now