From: John Gibson (johngibson1541@yahoo.com)
Date: Wed May 16 2007 - 18:21:56 ART
Maybe 3550 doesn't do well at per-port-per-vlan
qos when the vlan is to match an isolated or
community vlan, and just univercd hasn't documented
this.
Gotta do some actual test to verify.
--- John Gibson <johngibson1541@yahoo.com> wrote:
>
> Since private VLAN's doc says SVI only carries the
> primary VLAN, There is no such thing as taking QOS
> action on the isloated or community VLAN's frames
> in the SVI. To do that we have to disable SVI.
>
> But without SVI there is no such thing as Vlan-based
> QOS in 3560.
>
> However, if SVI is not needed in a particular
> network,
> without SVI, 3550 can still per-port-per-vlan QOS
> thus
> discriminating traffic with respect to VLAN. That
> needs to be done one port at a time. Administrative
> overhead, but works. But this can't be done in 3560
> at all. Because 3560 does not have "match vlan".
>
> > John Gibson wrote:
> > > Guess this is the solution for now. 3560's QOS
> > says
> > > "You can configure a hierarchical policy map
> only
> > on
> > > the primary VLAN of a private VLAN."
> > >
> > > 3550 lets us restrict QOS action to whichever
> VLAN
> > we
> > > want to specify, right ?
> > >
> > John,
> >
> > Another way of looking at this, however, is to say
> > that the 3550 does
> > not let us apply QoS to VLANs at all, only to
> ports.
> > Whereas the 3560
> > DOES let us apply QoS to vlans, via the SVI
> > interface.
> >
> > Granted that PER PORT, the 3550 makes it easier to
> > match traffic on a
> > particular vlan.
> >
> >
> > --
> > Hth,
> >
> > Bob Sinclair CCIE 10427 CCSI 30427
> > www.netmasterclass.net
> >
>
>
>
>
>
This archive was generated by hypermail 2.1.4 : Fri Jun 01 2007 - 06:55:21 ART