ES20 and ES+ Port Aggregation

Unanswered Question
Mar 31st, 2010

Hi pro,

Could these ports on ES20 and ES+ bundled together?

I have this problem too.
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Giuseppe Larosa Wed, 03/31/2010 - 09:32

Hello Huydien,



Layer 2 Features

Layer 2 switch port  (EtherChannel only)

EtherChannel and Link Aggregate  Control Protocol (IEEE 802.3ad)

An EtherChannel bundles individual Ethernet links  into a single logical link that provides the aggregate bandwidth of up  to eight physical links.The EVC EtherChannel feature provides support  for EtherChannels on Ethernet Virtual Connection Services (EVCS) service  instances.


these are ports with a lot of features so if you need a simple L2 etherchannel it would be better to use 2 ports of a simple GE linecard

Hope to help


huydien3384 Thu, 04/01/2010 - 00:13

Hi Giuseppe,

When I configured port-channel btw two port on different linecards, the router notified that cannot do that because qos-type of these line cards are not the same. I issued "no mls qos channel-consistency", but did not know how this impact the network performance.

Under default configuration ports in ES20, we have "mls qos trust", but not in ES+, so what is the alternative command for "trust qos" on ES+?


Giuseppe Larosa Thu, 04/01/2010 - 06:45

Hello Huydien,

ES+ looks like to support modular QoS marking instead of port trust see

given this I'm afraid the QoS capabilities mismatch is real, you could implement a policy map to mark all incoming traffic but how to apply it only to a member of the bundle?

Hope to help



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