What are the BGP peer limitations for a Cisco 1941-SEC/k9?

[netadmin10]

Hi Everyone,

I am in the process of setting up a new network which at the current time is specified to have 375 BGP peer configurations with one router. These peer configurations are for a failover link for all 375 routers and thus would not all be transmitting data at one time, not by a long shot.

Would the router handle this many configured peers? and would having this many peers configured consume all the resources of the router?

[Mark Malone]

HI

i doubt you will get a definite answer to that as it depends on so many factors in the setup of the network , the size of the BGP tables being taken in from each router, the stability of your network , how many would be active at a time , are the routers sending aggregated routes or all routes individually, speed of the routers in place and the speed of the links. A pure guess but a 1921 sounds a little low end for that many bgp peers whether active at once or not.

[netadmin10]

Hi,

Thanks for your reply. We are using 1941 routers, the network is very stable and we are using fiber for the most part. The bgp peers are only for failover of primary services so at any one time I wouldn't expect anymore than 10 connections active at any one time. At this time we are not sending aggregated routes.

Another solution was to configure EIGRP instead of BGP for the failover connections however this brought about the discussion of routing issues as traffic flows from the EIGRP network into a BGP WAN.

[Mark Malone]

Hi just remember this unit has a total throughput of around 150mbps that's with no services enabled , in real world a good bit less , the more links you have active at once the less this router will cope, bgp can also uses a lot of memory due to the size of the tables if there not filtered coming in from ISP just something else to take into account