2 BGP questions

[mohammedmahmoud]

Hi All,

i've got two BGP questions which i would be glad to find an answer for.

1st: What is max number of paths that BGP can load balance over by default. And what is the maximum configurable number ?

2nd: Is a multihomed router a router connected to more than one ISP, or just a router having a multiple link to internet (even if only one ISP)?

Thanks in advance.

[Georg Pauwen]

Hello Mohammed,

TMBK, BGP by default only installs one best path in the routing table. The maximum number of parallel routes that can be configured depends on the IOS version being used, check the link below:

maximum-paths

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/iprrp_r/ip2_k1g.htm#wp1058523

As for the multihoming, it simply means that you have multiple connections to the Internet, regardless of if that is to the same or different providers:

What is Multi-homing anyway?

http://info.connect.com.au/docs/routing/general/multi-faq.shtml#q2

Also check this document, which explains various multihoming scenarios:

Load Sharing with BGP in Single and Multihomed Environments: Sample Configurations

http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml

HTH,

GP

[mohammedmahmoud]

Thanks very very very much GEORG.