05-07-2014 11:33 PM - edited 03-04-2019 10:56 PM
Dear All,
What is the best way to do a iBGP Load Balancing ???
05-08-2014 05:02 AM
do you have EBGP to your both upstreams?
05-08-2014 06:07 AM
05-08-2014 05:27 AM
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Posting
You're looking for something better than iBGP ECMP?
If so, you could consider PBR or (probably the best) OER/PfR (if supported by your platform).
05-08-2014 05:53 AM
I need a iBGP Load Balancing setup. Any way I used BGP multipath ibgp option. But I'm not confident with that cause it's configuring global.
05-08-2014 06:44 AM
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Posting
Why are you not confident because it global?
In any case, from your diagram, assuming your iBGP peers have more bandwidth to the two egress routers, and your egress routers are much more bandwidth constrained to the Internet, OER/PfR might be good for R1 and R2.
05-08-2014 09:22 AM
Because I'm using multipath value as 2 ... where as an example R3 has more than 2 peers. I'm not sure ( not very much clear ) above command is going to impact other peers as well :( ...
Anyway I'm not very much familiar with OER/PfR .. need to do a reading :)
thanks mate :) !!!!
05-08-2014 10:06 AM
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Posting
Multipath usually supports more than 2. How many depends on device and its installed IOS.
05-09-2014 12:21 AM
Hi,
I'm a little confused by " ... where as an example R3 has more than 2 peers."
a) R3 router on your diagram below has got 2 neighbors only?!
b) maximum-paths ibgp maximum-number
command does not allow more than 2 parallel iBGP routes on your router?
See http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/15-mt/irg-15-mt-book/irg-multi-load.html#d128225e617a1635
for details.
Best regards,
Milan
05-09-2014 02:40 AM
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Posting
To expand on Milan's second point, from 15.1 reference guide.
The number of paths that can be configured is determined by the version of Cisco IOS software as shown in the following list:
05-09-2014 02:57 AM
Dear Milan/Joseph thanks for replying.......
Please refer the below diagram ..... According to that R3 will have routes from R1 & R2 and other downstream routers as well. So my point is when we configured
maximum-paths ibgp maximum-number .... It should effect other peering prefixes as well ???
05-09-2014 03:31 AM
isclaimer
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Posting
Yes, the max paths impacts all, but from R3, it doesn't have multi-path to its downstream routers.
05-09-2014 05:04 AM
Hi,
are you afraid of the same prefix advertised by two downstream routers?
Or even by downstream and upstream routers?
So you would like to loadshare to the upstream routers only?
In that case you would need to configure eBGP to them and use eBGP loadsharing, I'm afraid.
Best regards,
Milan
05-08-2014 09:01 PM
Is OER/PfR getting deprecated ???
05-09-2014 02:32 AM
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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
OER (v1) sort of yes, because of PfR (v2). Unaware of such plans for PfR. Did you see something to make you think this?
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