PORT-CHANNEL ISSUE

[raphaelgroult]

I have configured 2 port-channels ( PO18 and PO19) linking 8 interfaces ( CAT6 ) from HP Blade to Catalyst 6509. During the configuration have noticed that catalyst 6500 created "subinterfaces" as shown below:

SWCRJ-CORE#show etherchannel summary
Load for five secs: 3%/10%; one minute: 5%; five minutes: 5%
Time source is NTP, 14:35:31.640 BRV Tue Dec 21 2010

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      N - not in use, no aggregation
        f - failed to allocate aggregator

        M - not in use, no aggregation due to minimum links not met
        m - not in use, port not aggregated due to minimum links not met
        u - unsuitable for bundling
        d - default port

        w - waiting to be aggregated
Number of channel-groups in use: 33
Number of aggregators:           39

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
1      Po1(SD)          -
2      Po2(SU)          -        Gi1/3/14(P)    Gi2/3/14(D)
3      Po3(SU)          -        Te1/1/1(P)     Te2/1/1(P)
4      Po4(SU)          -        Te1/1/2(P)     Te2/1/2(P)     Te2/2/3(D)
5      Po5(SU)          -        Gi1/3/9(P)     Gi2/3/9(P)
6      Po6(SU)          -        Gi1/3/7(P)     Gi2/3/7(P)
7      Po7(SU)          -        Gi1/3/5(P)     Gi2/3/5(P)
8      Po8(SU)          -        Gi1/3/10(P)    Gi2/3/10(P)
9      Po9(SU)          -        Te1/1/3(P)     Te2/1/3(P)
10     Po10(SU)         -        Te1/1/4(P)     Te2/1/4(P)     Te2/2/4(D)
11     Po11(SU)         -        Gi1/3/8(P)     Gi2/3/8(P)
12     Po12(SU)         -        Gi1/3/6(P)     Gi2/3/6(P)
13     Po13(SU)         -        Gi1/3/11(P)    Gi2/3/11(P)
14     Po14(SU)         -        Gi1/3/12(P)    Gi2/3/12(P)
15     Po15(SU)         -        Gi1/3/13(P)    Gi2/3/13(P)
16     Po16(SD)         -
17     Po17(SD)         -
18     Po18(SU)        LACP      Gi1/9/25(P) <<<<<<<<<<<
18     Po18C(SU)       LACP      Gi1/9/28(P)
18     Po18A(SU)       LACP      Gi1/9/26(P)
18     Po18B(SU)       LACP      Gi1/9/27(P)
19     Po19(SU)        LACP      Te1/1/8(D)     Te2/1/8(D)     Gi2/9/25(P) <<<<<<<<<<<<
19     Po19B(SU)       LACP      Gi2/9/27(P)
19     Po19C(SU)       LACP      Gi2/9/28(P)
19     Po19D(SU)       LACP      Gi2/9/26(P)
20     Po20(SU)         -        Gi1/3/15(P)    Gi2/3/15(P)
50     Po50(SU)         -        Te1/2/1(P)     Te1/2/2(P)
51     Po51(SU)         -        Te2/2/1(P)     Te2/2/2(P)
52     Po52(SU)         -        Gi1/9/11(P)    Gi2/9/11(P)
53     Po53(SU)         -        Gi1/9/12(P)    Gi2/9/12(P)
54     Po54(SU)         -        Gi1/9/13(P)    Gi2/9/13(P)
55     Po55(SU)         -        Gi1/9/14(P)    Gi2/9/14(P)
60     Po60(SU)        LACP      Gi1/7/31(P)    Gi1/7/33(P)    Gi1/7/34(P)
                                 Gi1/7/35(P)
61     Po61(SU)        LACP      Gi2/7/31(P)    Gi2/7/32(P)    Gi2/7/33(P)
                                 Gi2/7/34(P)
62     Po62(SU)         -        Gi1/3/16(P)    Gi2/3/16(P)
63     Po63(SU)         -        Gi1/3/17(P)    Gi2/3/17(P)
64     Po64(SU)         -        Gi1/3/18(P)    Gi2/3/18(P)
100    Po100(RU)        -        Te1/5/4(P)     Te1/5/5(P)
101    Po101(RU)        -        Te2/5/4(P)     Te2/5/5(P)

I have tried a lot of combination but no joy. At this moment this is the configuration of the interfaces:

interface Port-channel18
description Blade 3 Modulo1
switchport
switchport access vlan 666
switchport trunk encapsulation dot1q
switchport trunk native vlan 987
switchport trunk allowed vlan 505,506,1100-1109,1170
switchport mode trunk
switchport nonegotiate
logging event link-status
mls qos trust cos
end
==============

interface GigabitEthernet1/9/25
description Blade 3 Modulo 1 Porta 21
switchport
switchport access vlan 666
switchport trunk encapsulation dot1q
switchport trunk native vlan 987
switchport trunk allowed vlan 505,506,1100-1109,1170
switchport mode trunk
switchport nonegotiate
logging event link-status
mls qos trust cos
channel-group 18 mode passive <<<< Already tried active

spanning-tree portfast edge

====================

interface Port-channel19
description Blade 3 Modulo2
switchport
switchport access vlan 666
switchport trunk encapsulation dot1q
switchport trunk native vlan 987
switchport trunk allowed vlan 505,506,1100-1109,1170
switchport mode trunk
switchport nonegotiate
logging event link-status
mls qos trust cos
end
========================

description Blade 3 Modulo 2 Porta 21
switchport
switchport access vlan 666
switchport trunk encapsulation dot1q
switchport trunk native vlan 987
switchport trunk allowed vlan 505,506,1100-1109,1170
switchport mode trunk
switchport nonegotiate
logging event link-status
mls qos trust cos
channel-group 19 mode passive <<<< Already tried active
spanning-tree portfast edge

At the blade only have configured LACP and priority 100 on all interfaces.

Does anyone know any action to fix this situation?

Regards,

Raphael

[glen.grant]

   If using lacp at least one side has to be "active".  Valid states for each side is  active -- active or  active-- passive .   Both sides need to be configured exactly the same . For port channel 19  it looks like you may have tried to use a already taken port channel number as it shows you have 6 different ports in that port channel.

[raphaelgroult]

Hello Grant

We already configured both sides as active-active and active-passive, bot no joy.

I guess that it could be anything wrong at the blade.

[Matthew Blanshard · Accepted solution]

Hello Raphael,

When using LACP and you see a port-channelA, B, C, etc those are called secondary aggregators and it means that LACP is enabled on the far port but something is causing it to be unable to bundle with the main channel.  This is usually caused by receiving different system id's from the far side by having the interfaces cabled between multiple devices.

First thing I would do is make sure that all the cabling is correct and that all of the ports in po18 and po19 are going to just one switch for each port-channel.

-Matt

[raphaelgroult]

Hello Matt

You were fully correct about the system id mismatch. At the far side ( HP BLADES ) both interfaces were exporting system id 20; my core were exporting system id 18 and 19 (Port-channels). The issue was solved by configuring the correct system id on the Blade.

Thanks a lot for your help.

Regards,

Raphael