Problem with Port Channel on ASR920

[jorge vinueza]

Hi to all,

When i create a Port Channel on an ASR920 by default it is a L3 Port Channel, how can i make it L2?

1      Po1(RD)                LACP     Gi0/0/11(D)

RU - L3 port-channel UP State
SU - L2 port-channel UP state

Because the remote site is a ME3600 configured as L2 Port Channel

When i configure the L3 Port Channel on an ASR901 as  "channel-group 1 mode on" it brings up but ASR920 only have mode active or passive

Could anybody help me please?

Thanks

[Philip D'Ath]

Here are the instructions for doing this.

http://www.cisco.com/c/en/us/td/docs/wireless/asr_901/Configuration/Guide/b_asr901-scg/b_asr901-scg_chapter_01001.html#task_1059767

[jorge vinueza]

thanks but that article is about ASR901 configuration, i need to configure it on an ASR920

[Mark Malone]

Hey here is the 920 doc

http://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/ce/b_ce_xe-313s-asr920-book/b_ce_xe-313s-asr920-book_chapter_01010.html#GUID-82096A30-31B4-4F31-B812-FCC87D60DFE0

It does not look like the 920 supports on mode and has to use the either lacp or pagp looking at the doc , always best to negotiate the po rather than to force it in most cases and not use the protocol , can you not change the 901 to use lacp , 901 as active and 920 as passive

What do you mean it becomes layer 3 , that only happens to a port-channel when you apply the ip address , does it no allow the channel-group  syntax until an ip is on the po ?

[jorge vinueza]

thanks for your answer,.

currently i have an ASR901 connected to a ME3600 (i don´t have managment of it), ASR901 is configured as L3 Port Channel with LACP mode active and ME3600 is configured as L2 Port Channel with LACP mode active.

I need to change my ASR901 to an ASR920 to support VPLS but when i configure ASR920 as L3 Port Channel with LACP mode active it does not came up.

I tested on the ASR901 a L3 Port Channel as mode on and it works but i can not configure mode on in ASR920

In a ME3600 you need to configure the channel-group first and the Port Channel is created by default. In ASR920 you have to create the interface Port Channel first and the channel-group later

[Mark Malone]

Hey so 1 side is layer 3 setup but the other is layer 2 and the port-channel formed , can you post the show etherchannel summ is it formed as layer 2 though , I cant see how it would form as layer 3 with only 1 side having an ip address ?

If the ME3600 is active did you try passive on the ASR in channel-group

[jorge vinueza]

I don't have management of the me3600 but im sure it is configured as L2 Port Channel because they have configured service instances on it, in the ASR901 it also have service instances configured on it but the Port Channel always shows as L3:

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
5      Po5(RU)         LACP      Gi0/6(P)    Gi0/7(P)

interface Port-channel5
 mtu 2000
 no ip address
 load-interval 30
 no negotiation auto
 spanning-tree bpdufilter enable
 spanning-tree bpduguard enable
 service instance 100 ethernet
  encapsulation dot1q 100
  rewrite ingress tag pop 1 symmetric
  bridge-domain 100
 !

[Mark Malone]

Yes that's different compared to normal IOS I would expect to see SU but saying that the doc shows the same output RU when configured the same  and also SU - L2 port-channel UP state

so on the 901 you have the option of channel-group on which works and syncs up with ME3600 , that would make me think its set to on as well on the ME side

Now need to replace that with 920 but option channel-group on is not available you tried active it did not work and you tried passive and it did not work yes

To me really need to see what's configured on the ME3600 or at least ask them for the config of the po ,because I don't think anything you change on your side will bring it up as your out of options in terms of syntax , I would be looking at getting them to go lacp active then you match it on your side

Example Associating a Channel Group with a Port Channel

This example shows how to configure channel group number 5 and include it in the channel group.

Device1# configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Device1(config)# interface port 5
Device1(config-if)#
*Aug 20 17:06:14.417: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel5, changed state to down
*Aug 20 17:06:25.413: %LINK-3-UPDOWN: Interface Port-channel5, changed state to down
Device1(config-if)#
Device1(config-if)# interface gigabitethernet 0/0/2
Device1(config-if)# channel-group 5 mode active
Device1(config-if)#
*Aug 20 17:07:43.713: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/2, changed state to down
*Aug 20 17:07:44.713: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to down
*Aug 20 17:07:45.093: %C10K_ALARM-6-INFO: ASSERT CRITICAL GigE 0/0/2 Physical Port Link Down 
*Aug 20 17:07:45.093: %C10K_ALARM-6-INFO: CLEAR CRITICAL GigE 0/0/2 Physical Port Link Down 
*Aug 20 17:07:47.093: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/2, changed state to up
*Aug 20 17:07:48.093: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to up
*Aug 20 17:07:48.957: GigabitEthernet0/0/2 added as member-1 to port-channel5
 
*Aug 20 17:07:51.957: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel5, changed state to up
Device1(config-if)# end
Device1#
*Aug 20 17:08:00.933: %SYS-5-CONFIG_I: Configured from console by console
Device1# show etherchannel summary
Flags:  D - down        P/bndl - bundled in port-channel
        I - stand-alone s/susp - 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: 1
Number of aggregators:           1

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
1       Po1(RU)         LACP     Te0/3/0(bndl) Te0/3/1(hot-sby)