Aggregate address and summary address?
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11-04-2011 10:15 AM - edited 03-07-2019 03:13 AM
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
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11-04-2011 10:42 AM
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
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11-04-2011 12:34 PM
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
