[afnog] L2 channel errors

[Mark Tinka]

On Wednesday, November 02, 2011 05:26:53 PM ibtisam jamal 
wrote:

> from 4 ge interfaces on one ge PIC...

Sounds like you're talking about the 4-port Gig-E PIC. Just 
not sure what Juniper platform you're talking about.

> all 4 interfaces  show
> the errors ,while only 2 of them are configured as
> trunks the other 2 have only one vlan configured
> each.All the 4 interfaces have the L2 errors.Last night
> we tried to swap the PIC but today the same errors.

The 4-port Gig-E PIC, both for the M7i/M10i as well as the 
larger models, are oversubscribed 4:1. This means that 
effectively, with all ports running at line rate, you can 
only achieve 25% of 1Gbps on each port, as there is only a 
1Gbps connection to the PFE for that PIC.

The reason I bring that up is I'm not quite familiar with 
this PIC's architecture - I don't know whether the errors 
you're seeing are reported for all ports, or for each port.

You say that 2x of the ports are running 802.1Q. Please 
confirm whether all VLAN's coming into the router from the 
switch are present on both sides of the link.

Also, you mention that the other two remaining ports have 
only one VLAN each, but no 802.1Q enabled. I don't see how 
that's possible, as configurations of VLAN's on the PIC's 
requires 802.1Q ('vlan-tagging' in Junos speak) to be 
enabled.

> We also see packet drops under the class-of-service

I think let's look at that separately, in your e-mail on the 
same, so we don't get the thread confused :-).

Mark.
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