[c-nsp] 7600: etherchannel and aggregators

[Dmitry Kiselev]

Hello!

  I catch etherchannel aggregators problem on by 7600 box. :(
Two ports (g1/11, g1/12) just configured couldn't be aggregated
to LACP driven channel. Here is config and debug output:

interface GigabitEthernet1/11
 switchport
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport nonegotiate
 channel-group 2 mode active
!
exactly same config for g1/12-g1/16
!
interface Port-channel2
 switchport
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport nonegotiate
!


Router# sh etherc 2 sum
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port


Number of channel-groups in use: 3
Number of aggregators:           4

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
2      Po2(SU)         LACP      Gi1/13(P)   Gi1/14(P)   Gi1/15(P)
                                 Gi1/16(P)
2      Po2A(SU)        LACP      Gi1/11(w)   Gi1/12(w)



Sep 13 18:37:52.523: %LINK-3-UPDOWN: Interface GigabitEthernet1/11, changed state to down
Sep 13 18:37:59.779: %LINK-3-UPDOWN: Interface GigabitEthernet1/11, changed state to up
Sep 13 18:38:00.087: idbman_get_agport: could not delete the swidb if_index
Sep 13 18:38:00.091: idbman_get_agport: 14/4 Po2A(O)
Sep 13 18:37:59.762: %EC-SP-5-CANNOT_BUNDLE_LACP: Gi1/11 is not compatible with aggregators in channel 2 and cannot attach to them (trunk mode of Gi1/11 is trunk, Gi1/16 is dynamic)


Slot1 occupied with WS-X6748-GE-TX. Sup is RSP720 running SRB1

Is there any document where aggregators allocation described in depth?
I assume it should be line card (ASICs) specific.

Thanks!

-- 
Dmitry Kiselev