[c-nsp] cef load-sharing and recursive routing

[Xavier Nicollet]

I think I have nearly found what I want:

show cef table
 Output chain build characteristics:
  Collapse
     platform enable:     load-sharing
     operational for:     load-sharing

Does anyone know if it is possible to disable this colapse thing ?

Thanks !

2015-01-22 11:53 GMT+01:00 Xavier Nicollet <xnicollet at gmail.com>:

> Maybe this option could help:
>
> http://www.cisco.com/c/en/us/td/docs/ios/ipswitch/command/reference/isw_book/isw_c1.html#wp1030372
>
> However I have never met this. Anyone has ever used this on 7600 platform ?
>
> Regards,
>
>
> 2015-01-22 10:59 GMT+01:00 Xavier Nicollet <xnicollet at gmail.com>:
>
>> Hi,
>>
>> I have an issue with cef load-sharing used as a way to load-balance
>> servers.
>>
>> Cisco CEF tends to simplify some path, as in this exemple:
>>
>> ip route 10.30.30.30/32 web1 (directly attached)
>> ip route 10.30.30.30/32 web2 (remote site)
>> ip route 10.30.30.30/32 web3 (remote site)
>>
>> We would like to have each server with a weight of 1, having one third of
>> the traffic.
>>
>> However, CEF will count remote site as just one destination, leading to:
>>
>> #show ip cef 10.30.30.30 internal
>> 10.30.30.30/32, epoch 8, RIB[S], refcount 6, per-destination sharing
>> /SNIP/
>>   output chain:
>>     loadinfo 1A4EDAB4, per-session, 2 choices, flags 0083, 5 locks
>>     flags: Per-session, for-rx-IPv4, 2buckets
>>     2 hash buckets
>>       < 0 > IP adj out of Vlan9, addr 10.14.9.1
>>       < 1 > IP adj out of TenGigabitEthernet6/4, addr /SNIP/
>>
>> Has you see all the destination that lead to path Te6/4 will be accounted
>> for just one path.
>> This is very annoying since we have the same routes configured on remote
>> site, which can lead to routing loops for some
>> @IP src / @IP dst couples.
>>
>> Is there a way to force the router to put exactly the same weight for
>> each entry, without any path optimisation ?
>>
>> We are using cisco 7600 with RSP720. To my knowledge, openflow and such
>> are not supported on this platform, right ?
>>
>> Thank you for your help,
>>
>> --
>> Xavier Nicollet
>>
>
>
>
> --
> Xavier Nicollet
>



-- 
Xavier Nicollet