Mailing List Archive: nsp: juniper

MX480 L2/L3 with some packet loss for routed traffic on one interface only

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nsp at accelerated

Aug 9, 2012, 8:13 AM

Post #1 of 2 (224 views)
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MX480 L2/L3 with some packet loss for routed traffic on one interface only

Hello list,

I am a little lost here trying to find the cause for a little packetloss
(up to 1%) I'm seeing in our network. Here is the situation:

a MX480 is acting as a router and layer2 device using irb interfaces for
the routing. It connects two big switches with 10GE each. One is a Cisco
6509 with sup32, the other one a Brocade SuperX. Rapid spanning-tree is
active.
I am seeing 0% packet-loss for everything connected to the Cisco. There
is also no packet-loss for switched traffic that passes both switches
and the router as well. But there is packet loss for more or less all
routed traffic coming from the SuperX which variies between 0% and 1%.

Since only routed traffic is affected, one might safely asume that this
is not related to the switching hardware. The link itself can't be the
cause as well. It's furthermore unlikely that the router itself is
broken since everything coming from the cisco works fine.

Just to mention that: routed traffic might be externally or internally,
it doesn't make a difference.

This is the configuration for the interface facing the SuperX:

nico [at] MX48> show configuration interfaces xe-1/1/0
flexible-vlan-tagging;
encapsulation flexible-ethernet-services;
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 0-4094;
}
}

The other interface is actually an aggregated link consisting of 2x 10G
going to the Cisco. It looks pretty much the same but since there are
also a few routed-only units, the vlan-id-list looks a little different
in order to be able to set up those routed ports.

I am now seeking for hints what to do. Might the currently unnecessary
"flexible-vlan-tagging & flexible-ethernet-services" be the cause? This
is just to keep options open but is right now not required though and
will most likely consume a little more memory than required (shouldn't
be a problem with the MX though).
Might the xe-1/1/0 interface be broken? Unlikely in my opinion since l2
traffic works.

Any hint will be appreciated! Thanks in advance!

Nico
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nsp at accelerated

Aug 9, 2012, 9:19 AM

Post #2 of 2 (212 views)
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Re: MX480 L2/L3 with some packet loss for routed traffic on one interface only [In reply to]

Am 09.08.2012 17:13, schrieb Nicolaj Kamensek:

Update:

> Since only routed traffic is affected, one might safely asume that this
> is not related to the switching hardware. The link itself can't be the
> cause as well. It's furthermore unlikely that the router itself is
> broken since everything coming from the cisco works fine.
>
> Just to mention that: routed traffic might be externally or internally,
> it doesn't make a difference.

not all routed traffic is affected, it seems to be just a few servers
but there is no pattern ibvious yet. Since the affected servers didn't
show this behaviour 2 days ago before we changed the router
configuration to L2 + L3, it is very likely that this is related to this
somehow. Before that, the router was just a router and the switches were
connected with each other - just the Cisco was connected to the router.

Nico
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