From: Alex Hsieh (ccie21@xxxxxxxxxxx)
Date: Wed Dec 19 2001 - 21:05:53 GMT-3
So is it possible to do dot1q trunking on a 10 baset 2500 series router?
>From: "Joseph Ezerski" <jezerski@broadcom.com>
>Reply-To: "Joseph Ezerski" <jezerski@broadcom.com>
>To: "'Wade Edwards'" <wade.edwards@powerupnetworks.com>,
>"'fwells12'" <fwells12@hotmail.com>, "'Ryaboy Vadim'"
><VRyaboy@acuson.com>, ccielab@groupstudy.com
>Subject: RE: Trunking with 2901 switch
>Date: Wed, 19 Dec 2001 09:47:16 -0800
>
>It does make sense that a regular Ethernet port should not do ISL. The
>added 30 Bytes of encapsulation makes the packet a mini-giant (or larger,
>as
>the mini-giant is more akin to 802.1q) and much of the older 10BASET
>hardware does not support the added overhead. This is why you cannot trunk
>on 2500s. The hardware won't support it. Even on the newer stuff, you
>cannot trunk ISL on 10-Ethernet. I just tried it on a 2600 and I can trunk
>with 802.1q but not ISL.
>
>Just my 2 cents.
>
>-Joe
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Wade Edwards
>Sent: Wednesday, December 19, 2001 8:56 AM
>To: jezerski@broadcom.com; fwells12; Ryaboy Vadim;
>ccielab@groupstudy.com
>Subject: RE: Trunking with 2901 switch
>
>
>But still does not make sense to artificially limit ISL also. I'm sure
>I can put an ISL formatted packet on the line if I had a packet driver
>on a PC with a 10Mb Ethernet NIC. I think this is more of a design
>consideration than a physical limitation. Of course if they say it only
>supports 100Mb and limit it in software to only support 100Mb interfaces
>then people will be forced to buy routers with FastEthernet interfaces
>which are more expensive than Ethernet interfaces but have a higher
>margin. Sorry that was the conspiracist in me talking.
>
>There all out to get us and I am not paranoid.
>
>L8r.
>
> -----Original Message-----
>From: Joseph Ezerski [mailto:jezerski@broadcom.com]
>Sent: Wednesday, December 19, 2001 10:26 AM
>To: Wade Edwards; 'fwells12'; 'Ryaboy Vadim'; ccielab@groupstudy.com
>Subject: RE: Trunking with 2901 switch
>
>The funny part is, when all of us were studying for our CCNAs, and
>CCNPs, the books always hyped ISL and downplayed dot1q. They also
>always said, "with ISL you must always use a 100MB Ethernet interfaces".
>I think the limitation is in ISL and not in Dot1Q. I am not sure. I
>have not tried to trunk ISL on an 10-ethernet port.
>
>-Joe
>
>-----Original Message-----
>From: Wade Edwards [mailto:wade.edwards@powerupnetworks.com]
>Sent: Wednesday, December 19, 2001 7:10 AM
>To: Joseph Ezerski; fwells12; Ryaboy Vadim; ccielab@groupstudy.com
>Subject: RE: Trunking with 2901 switch
>
>
>There is nothing different from a 10Mb Ethernet interface and 100Mb
>Ethernet interface when it comes to being able to use trunking. If a
>100Mb Ethernet interface can add the 802.1q tags to a packet and send it
>out on the wire so can a 10Mb Ethernet interface. It just means that
>anything on that wire needs to understand the 802.1q tags or they will
>get very confused. I never could understand the Cisco limitation that
>only 100Mb and faster Ethernet interfaces could support trunking.
>
>L8r.
>
> -----Original Message-----
>From: Joseph Ezerski [mailto:jezerski@broadcom.com]
>Sent: Tuesday, December 18, 2001 7:22 PM
>To: 'fwells12'; 'Ryaboy Vadim'; ccielab@groupstudy.com
>Subject: RE: Trunking with 2901 switch
>
>I beg to differ. You used to be right. However, someone posted here
>awhile
>back about trunking on a 10Base interface, using dot1q. We were curious
>enough to duplicate this in our lab....and it worked. It floored me.
>So,
>you can trunk on 10base ethernet interfaces. There may be some code
>minimums there, like enterprise, etc. I would have to ask my co-worker
>which version he used. Of course, CCO has zero documentation on this
>and
>always refers to using Fast Ethernet ports to trunk.
>
>-Joe
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>fwells12
>Sent: Tuesday, December 18, 2001 3:19 PM
>To: Ryaboy Vadim; ccielab@groupstudy.com
>Subject: Re: Trunking with 2901 switch
>
>
>2501 will not trunk. You will need a 2620 at minimum. Trnking requires
>a
>100Mb ethernet interface.
>
>----- Original Message -----
>From: "Ryaboy Vadim" <VRyaboy@acuson.com>
>To: <ccielab@groupstudy.com>
>Sent: Tuesday, December 18, 2001 3:05 PM
>Subject: Trunking with 2901 switch
>
>
> > Is it possible to set trunking between 2901 switch and 2501 router ?
> >
> > Can not get trunking to work. It shows status not-trunking.
> >
> > I've tried different ports, read all groupstudy and cisco
> >
> > web site ,but could not find relevant info.
> >
> > Seems 2901 is limited in trunk setup. But it has set trunk command.
>So,
> >
> > it should be possible to set up trunking, right?
> >
> > Any comments, examples ?
> >
> > Anybody successfully configured router-on-stick with 2901 and 2500
>series
> > router?
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