LACP on ISR G2 1921: How ?

[sylvain.munaut]

Hi,

I'd like to have a redundant link from the 1921s to my switch stack. So I was thinking of LACP.

The Cisco feature navigator clearly lists this for 15.1(4)M on 1921 platform :

Link Aggregation Control Protocol (LACP) (802.3ad) for Gigabit Interfaces

So this should clearly be supported but somehow I can't find how to do it ...

Currently I managed to configure a 'static / forced' one with:

interface Port-channel1

ip address 192.168.0.2 255.255.255.0

interface GigabitEthernet0/0

channel-group 1

interface GigabitEthernet0/1

channel-group 1

But I can't figure how to enable LACP ...

Some guides said I must use channel-group 1 mode active . But this doesn't seem to exist here. Some other said to use this but on the Port-Channel interface, again no luck ..

So how is this configured ?

Cheers,

    Sylvain Munaut

[Giuseppe Larosa · Accepted solution]

Hello Sylvain,

LACP might be supported only on etherswitch modules and not on the built-in ports

I would expect this.

see

http://www.cisco.com/en/US/docs/ios-xml/ios/lanswitch/configuration/15-1mt/Cisco_HWIC-4ESW_and_HWIC-D-9ESW_EtherSwitch_Interface_Cards.html#GUID-0A778F20-4F4A-48F9-A20D-F345EA58F0C6

Hope to help

Giuseppe

[sylvain.munaut]

Turns out you're right ... I do find this a little surprising because etherchannel works, only LACP negatiation doesn't and I would have expected they could do it entirely in software ... (I mean a standard PC with two NICs can do it ...)