ELRP Configuration - summitX-15.3.4.6-patch1-14.xos

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When configuring ELRP, what if you include uplink ports in your VLAN statement, but then issue the disable- port exclusion command. Will excluding the uplink ports take precedence over them being added in the first place? Thanks in advance.
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Dave Smith

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Posted 2 years ago

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Aleixo Gomes, Employee

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hi , 

So elrp sends out elrp packets on the enabled port, but looks at all ports for received packets. It received it on say  port 1, port 1 is not excluded from ports to disable so it disables port 1.

we exclude the uplink ports so it is not affecting other vlans that it is loop detected

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Patrick Voss, Alum

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This is the recommended way to configure ELRP. In an all EXTREME network it makes it easier to trace down where a loop is coming from. Even though the uplink is excluded from any action configured it will still log a loop and tell you which port it is ingressing and egressing out of.
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Dave Smith

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Thanks. On some of our ELRP configs, there are some uplinks added to some vlans. With this being the case, it is going to disable those ports if there is a loop . With that being the case, I would like to disable those uplinks without having to search through the configs and remove those uplinks. I was wondering if I could run "configure elrp-client disable-port exclude xx" in Netsight on all my access switches and that would override any of those uplinks being added?
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Dave Smith

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correction - not disable the uplinks - should be remove those uplinks from the ELRP config.
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Patrick Voss, Alum

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Hello Dave,

Sorry for the confusion. That is what I was implying. Exclude the uplinks in the disable ports list and they will not be disabled if a loop is found on them but they will still log a loop on that port.
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Erik Auerswald, Embassador

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Hi,

if you add ELRP to the uplinks of all switches you will create a relatively high rate of flooded frames. You should limit ELRP on the uplinks to two switches in every L2 domain.

Thanks,
Erik