[c-nsp] Load balancing on portchan (4500X->ASR1006)

["Rolf Hanßen"]

Hello,

I read your mail twice and still don't know which direction is affected
(4500X tp ASR or ASR to 4500X or both).
Please be aware that the balancing hash method only affects outbound
traffic, so changing the method on the 4500X only affects traffic towards
the ASR.
Using mac adresses for balancing is a bad idea. Years ago we had the great
idea to connect several servers with dual nic to a router with a 2 port
channel switching between.
MAC on the router was always the same, MACs on the servers were all even
because we used the same port on all servers.
Result: no balaning at all.

Is the switch able to use IP / Port for all frames or do you have packts
it maybe does not understand (like MPLS Packets)?

kind regards
Rolf

> Hi Everyone - Have a 4 port etherchan between ASR1006/4500X(In VSS) -
> Tried virtually all the load-balancing options on the 4500X, but port "1"
> in the portchan group always gets majority of traffic share.
>
>
> Links are:
>
>
> ASR1006      4500X (2)
>
> 0/0/3            1/1/4
>
> 1/0/0            1/1/16
>
> 1/0/3            2/1/4
>
> 2/0/0            2/1/16
>
>
> src/dst ip - I get both ports on "primary" 4500X being primarily used
> (1/1/4 getting the most)
>
> src/dst mac - I get a bit of a better load spread, but 2/1/4 gets very
> little traffic, and again 1/1/4 gets the most
>
> src/dst port - 1/1/4 gets the most, 2/1/16 gets a lot more (ingress),
> 2/1/4, very little
>
>
> The portchan peak usage is 2 to 2.5Gb/sec, but would do more, as it is
> being limited by the load-balancing....i.e 1/1/4 will max out at 1G/sec
> (We have a very bursty traffic.....SP - So mix of
> Inet/L3VPN/backup/replication etc)
>
>
> If anyone has some suggestions on how to achieve a better(more even)
> traffic spread, it would be greatly appreciated....Migrating to 10Gb is
> what we plan to do, but am interested in anyones comments on why 1/1/4 is
> used so heavily regardless of the load-balancing algorithm used (Assuming
> it is because it is the "first" port....spanning tree  probably preferring
> this port?)....the ASR1006 only has 2 load-balancing options flow-based or
> vlan-manual......lol and I dont have any interest in setting up manual
> vlan load-balancing 😉)
>
>
> Thanks
>
>
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