Aggregate address and summary address?

[sathyasav]

Can some one tel me what is aggregate address in BGP and summary address in eigrp and ospf.

Is aggregate address and summary address same or different?

Thanks,

SATHYA

[Reza Sharifi]

They are the same.  With BGP you can use aggregate and summary in the same line.

http://www.cisco.com/en/US/docs/ios/12_2/iproute/command/reference/1rfbgp1.html#wp1017390

HTH

[cadet alain]

Hi,

there is one difference though,  when a summary- address is configured in EIGRP or OSPF the subnets comprising the summary are not advertised, you can do it in EIGRP with a leak-map but not in OSPF as far as I know.

In BGP the default with the aggregate-address is to also send the subnets part of the summary and you can disable this with the summary-only keyword.

I don't know of any summary-address  command in BGP but you can summarize at classful boundary with the auto-summary command but it is working differently from IGP and also wheter you are using network commands or redistributing the prefixes.

Regards.

Alain