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iBGP Load Balancing

Dear All,

What is the best way to do a iBGP Load Balancing ???

16 REPLIES
New Member

do you have EBGP to your both

do you have EBGP to your both upstreams?

New Member

Following is the basic setup

Following is the basic setup of my Network. I want to load share R3,R4,R5,R6 traffic between R1,R2 routers.

Hope you all understand the diagram.

 

 

 

 

Super Bronze

DisclaimerThe Author of this

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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).

New Member

I need a iBGP Load Balancing

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.

 

 

Super Bronze

DisclaimerThe Author of this

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

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

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.

New Member

Because I'm using multipath

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 :) !!!!

Super Bronze

DisclaimerThe Author of this

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

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

Multipath usually supports more than 2.  How many depends on device and its installed IOS.

Hi, I'm a little confused by

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

 

Super Bronze

DisclaimerThe Author of this

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The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

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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

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:

  • Cisco IOS Release 12.0S-based software: 8 paths
  • Cisco IOS Release 12.3T, 12.4, 12.4T, and 15.0-based software: 16 paths
  • Cisco IOS Release 12.2S-based software: 32 paths
New Member

Dear Milan/Joseph  thanks for

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 ???

 

 

Super Bronze

isclaimerThe Author of this

isclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

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

Yes, the max paths impacts all, but from R3, it doesn't have multi-path to its downstream routers.

Hi,are you afraid of the same

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

 

New Member

Is OER/PfR getting deprecated

Is OER/PfR getting deprecated ???

Super Bronze

DisclaimerThe Author of this

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

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?

New Member

One of my colleague said PfR

One of my colleague said PfR is replacing by OnePK... 

Super Bronze

Hmm, OnePK I guess someone

Hmm, OnePK I guess someone might do something similar to PfR using OnePK, but I doubt you'll see a OnePK replacment for PfR anytime real soon.

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