[c-nsp] etherchannel cisco to checkpoint VSX

[Klaus Kastens]

Hi,

> We are experiencing an issue with the  etherchannel  between a cisco
> 3750 and checkpoint VSX.
> 
> The channel comes up but no traffic is passing through.   (not even
> ping between the directly connected interfaces is sucessful)
> On both boxes is ARP shown as incomplete).
> 
> On the switch side we trested with channel mode
>  - active (LACP) and
>  - mode on

Did you test with only one interface per port channel?

> - CP is configured with LACP
> 
> Anyone had a similar experience ?

Yes, in a VSX cluster port channels (LACP) on one node were working, but
not on the other. Disabling all but one interface on the switches "fixed"
the problem.

The problem was independent of the switch type (N5k, 3750) or interface
card (10G/1G) on the VSX.

All miimon timers on the failing bond interfaces were zero (default after
loading the kernel module), setting these via /sys in the kernel fixed the
problem. (Setting these via sysconfig only worked after several attempts.)

    [Expert at fwvsx0:0]# cat /proc/net/bonding/bond0
    Ethernet Channel Bonding Driver: v3.2.4 (January 28, 2008)

    Bonding Mode: IEEE 802.3ad Dynamic link aggregation
 -> Transmit Hash Policy: layer2 (0)
    MII Status: up
 -> MII Polling Interval (ms): 0
 -> Up Delay (ms): 0
 -> Down Delay (ms): 0

Port channels worked after setting polling interval to nonzero:

    echo 100 > /sys/class/net/bond0/bonding/miimon


On the working node timers were correctly configured and applied to
the kernel.

    [Expert at fwvsx1:0]# cat /proc/net/bonding/bond0
    Ethernet Channel Bonding Driver: v3.2.4 (January 28, 2008)
    
    Bonding Mode: IEEE 802.3ad Dynamic link aggregation
    Transmit Hash Policy: layer3+4 (1)
    MII Status: up
    MII Polling Interval (ms): 100
    Up Delay (ms): 200
    Down Delay (ms): 200


 Best regards,
 Klaus Kastens

-- 
Klaus Kastens                                               NetUSE AG
Dr.-Hell-Str. 6, D-24107 Kiel,                                Germany
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