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LAG configuration issues on Cisco SG300 52 switch

Vishal.Seetal
Level 1
Level 1

Hi all,

I am trying to configure LAG on four G/e ports on the Cisco SG300 52 switch which are connected to the four G/e NICs on a Dell R710 server. The four switch ports are thus edgeports. Without LAG configuration, the individual ports would forward traffic fine. But when I configure LAG, the ports would not forward any traffic.

A look at the four LAG member ports STP interfaces status show edge port Disabled, STP enabled, Port role Disabled, Port State N/A, Designated Bridge ID N/A, Designated Port ID N/A, Designated Cost N/A and Forward transitions N/A.

The ports STP interfaces status show the ports are not forwarding. I know that etherchannel cannot be configured on edgeports but I thought I could configure LAG which is a new technology, on edgeports. There is no mention on the SG300 series datasheet that LAG should be configured only on trunks.

I would really appreciate if anyone could help me set up LAG for my conection between the switch and the Dell server. LAG would be an important feature as it would allow me to balance the load on all four NICs on my Dell Server and also dynamic LAG would make sure that if one of the NICs go down, then the load will be balanced amongst the other three NICs.

Thank you.

Vishal

1 Reply 1

Peter Paluch
Cisco Employee
Cisco Employee

Vishal,

I have no direct experiences with the SG300 but I assume that it supports the LACP protocol to negotiate the creation of an EtherChannel (should be the same as LAG) with the neighboring device. Are you able to verify if the SG300 supports the LACP? Are you also able to run it on your Dell server towards the switch? It is even possible that the SG300 expects the Dell to start negotiating the EtherChannel using LACP and if it does not speak the LACP, the EtherChannel can not be formed.

Best regards,

Peter

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