From: Tyler Pomerhn (tpomerhn@xxxxxxxxx)
Date: Thu Feb 15 2001 - 18:59:37 GMT-3
TR-ISL (RIF passthrough on an ISL trunk) exists on 7200 series.
Typically, the gear used to make FDDI and other legacy LAN protocols
interoperate with other technologies like Ethernet and ATM terminates
the RIF locally before translationally bridging or routing the frame to
the other topology - it's not usually trunked to another device.
I think the rationale was twofold:
1) The older Ethernet ints used a controller that's VERY limited (i.e.
can't do things like MHSRP) - makes it hard to transmit a >1500 byte
frame, perhaps?
2) If you're trunking, you're probably bringing together a lot of data
from multiple VLAN's - too much for a single Ethernet int.
Just speculation at this point, but that's all I got.
tp
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Tom Lancaster
> Sent: Thursday, February 15, 2001 3:57 PM
> To: Ccielab@Groupstudy. Com
> Subject: RE: Is ISL on 2610 possible?
>
>
> Out of curiosity, does anyone know WHY Cisco has only
> implemented ISL on FE?
> My understanding of the spec (based on white papers on CCO)
> is that the ISL
> protocol supports Token Ring, FDDI, etc. and in fact goes to
> great lengths
> to support things like RIF so that frames from different
> topologies can
> coexist (encapsulated) on an uplink, but none of these were ever
> implemented.
>
> thx,
> -tom
>
> > -----Original Message-----
> > From: Andrew [mailto:arousch@home.com]
> > Sent: Thursday, February 15, 2001 3:43 PM
> > To: Tariq Sharif; Ccielab@Groupstudy. Com
> > Subject: Re: Is ISL on 2610 possible?
> >
> >
> > 2610 cannot do ISL.
> >
> > At 05:51 PM 2/15/01 +0000, Tariq Sharif wrote:
> > >Has anyone got ISL on 2610 working? Fastether NM is
> > recognized & commands
> > >(int f1/0.1, encap isl 1 etc) accepted but can't do router
> > on a stick VLAN
> > >interrouting.
> > >
> > >Have got the same card working in 3620 (same configs). Just
> > curious if poss
> > >on 2610. Cisco web says can't, but commands are picked up....
> > >
> > >Many thanks & regards.
> > >
> > >Tariq Sharif
> > >
> > >
> > >
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