[j-nsp] Gig-E framing issues M20 vs. Nortel 1400

[Rafal Szarecki (WA/EPO)]

> We're encountering some problems connecting a juniper M20 
> (running JUNOS
> 7.0R2.7) to a nortel 1400 using gigabit ethernet. Behind the nortel
> we're experiencing some drops in a multicast stream.

What about Unicast?
  
> I've been told that the juniper doesn't comply with the ieee standard
> for the interframe gap, which should apparently be 96 bits, 
> and that the
> nortel has problems with smaller gaps. So I'm looking for a 
> way to tweak
> this size on the juniper side, so far without any luck.

Interesting. I do not want to say this is not true,but... Who told you this? I guess JNPR use standard CHIP for handle such low level Ethernet operation, but no sure.

Do you try "flow-controll" under [edit interfaces interface-name gigether-options] ?



>  
> Can anybody here shed some light on this? Is it possible to change the
> interframe gap on a juniper?


If unicast traffic of same load is fine then this is not interframe gape issue but rather nortel performance issue...

Rafal Jan Szarecki JNCIP#135

Senior Consultant - Datacom Networks
Ericsson Poland EPO/S/D
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