Multi-Chassis EtherChannel

One VSS supports a maximum of 512 – 2 port channels (deducting 2 POs for VSL) Configuration of MEC is not different than any regular etherchannel! The Different is physical connectivity, one link connects to VSS Active and the other link connects to VSS Standby chassis creating a high bandwidth active/active aggregated link-bundle (Etherchannel)

Access switch:
interface GigabitEthernet1/1/1
channel-group 10 mode on
!
interface GigabitEthernet1/1/2
channel-group 10 mode on
Core switch:
interface Port-channel10
switchport
!
interface GigabitEthernet1/3/17
switchport
channel-group 10 mode on
!
interface GigabitEthernet2/3/17
switchport
channel-group 10 mode on
Verify:
6500A#sh etherchannel summary
Number of channel-groups in use: 3
Number of aggregators: 3
Group Port-channel Protocol Ports
——+————-+———–+————————————–
10 Po10(SU) – Gi1/3/17(P) Gi2/3/17(P)
100 Po100(RU) – Te1/5/4(P) Te1/6/4(P)
200 Po200(RU) – Te2/5/4(P) Te2/6/4(P)

Switch12#sh etherchannel summary Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
——+————-+———–+————————————–
10 Po10(SU) – Gi1/1/1(P) Gi1/1/2(P)