From: Gregory Gombas (ggombas@gmail.com)
Date: Mon Aug 27 2007 - 15:54:38 ART
I am not using PAGP in my setup...
On 8/27/07, Bit Gossip <bit.gossip@chello.nl> wrote:
> For PAgP, LACP and ULD to work it is mandatory that the intermediate switch
> emulates point-to-point connections which means 2 different VLANs
>
> "PAgP, LACP, and UDLD protocol tunneling is only intended to emulate a
> point-to-point topology. An erroneous configuration that sends tunneled
> packets to many ports could lead to a network failure. "
>
> http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12225see/scg/swtunnel.htm
>
> Thanks,
> Bit.
>
> ----- Original Message -----
> From: "Joseph Brunner" <joe@affirmedsystems.com>
> To: "'CCIE 19999'" <ccie@iprimus.com.au>; "'Gregory Gombas'"
> <ggombas@gmail.com>; "'Cisco certification'" <ccielab@groupstudy.com>
> Sent: Monday, August 27, 2007 2:35 AM
> Subject: RE: IE Lab9 Task 1.7 L2 Tunnel
>
>
> >I tried to get it going as the task hinted, with 1 vlan only. The channel's
> > kept bouncing and pings were not successful. I realized how etherchannel
> > is
> > a POINT TO POINT technology. Using 1 vlan for "both dot1q tunnels" would
> > break that point to point technology, and make it running etherchannel via
> > hub (of sorts)...
> >
> > I did it with 2 vlans, and it worked, so I verified, add the points and
> > kept
> > going.
> >
> > LOL
> >
> > -Joe
> >
> > -----Original Message-----
> > From: CCIE 19999 [mailto:ccie@iprimus.com.au]
> > Sent: Sunday, August 26, 2007 7:32 PM
> > To: 'Joseph Brunner'; 'Gregory Gombas'; 'Cisco certification'
> > Subject: RE: IE Lab9 Task 1.7 L2 Tunnel
> >
> > Joe,
> >
> > When you apply the command L2protocol-tunnel cdp, the end ports would see
> > each other directly connected. Isn't it? Also, the task says, IF YOU NEED
> > ANY ADDITIONAL VLANS, then use 100. And you are using 100 and 101. Is that
> > a
> > correct approach?
> >
> > So in my opinion, of you can get this working without using any additional
> > vlans, the solutions must be correct.
> >
> > Any addional thoughts welcome.
> >
> > Regards,
> > Shine
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Joseph Brunner
> > Sent: Monday, 27 August 2007 8:36 AM
> > To: 'Gregory Gombas'; 'Cisco certification'
> > Subject: RE: IE Lab9 Task 1.7 L2 Tunnel
> >
> > Because they are asking you to make the logical topology do one thing,
> > (two DIRECT links between Sw3 & Sw4 using the stated ports), when in the
> > physical topology those ports are indeed going to SW1.
> >
> > So SW1 must be INVISIBLE between SW3 & 4 on this L3 ether-channel link.
> >
> >>I was able to get this working simply with the l2protocol tunnel
> >>command on the middle switch with the ports in access mode.
> >
> > Read the task again, Look at where they say "if an additional VLAN is
> > needed
> > use VLAN 100"... This should give you the hint you need to approach this
> > task - Dot1q-tunnel mode on SW1, the intermediary...
> >
> > Look at the solution where they use VLAN 100 + VLAN 101 as each
> > "link" between SW3 and SW4 needs an intermediary vlan to tunnel the
> > etherchannel on. I tried this task without making two vlans and the
> > channel
> > didn't work properly. Originally, I just tried to use VLAN 100 on all 4
> > ports of SW1. I realized the channeling was getting confused and it was
> > looping traffic. I created a second vlan (like they did, 101) and the
> > channel did come up fine.
> >
> > With your solution, what was your verification you had completed the task?
> > Did you verify on SW3 & SW4 "show etherchannel summary" ?
> > Did you verify on SW1 "show interface switch | beg 0/17 ?
> > Did you verify on SW1 "show interface switch | beg 0/18 ?
> > Did you verify on SW1 "show interface switch | beg 0/20 ?
> > Did you verify on SW1 "show interface switch | beg 0/21 ?
> >
> >
> > -Joe
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Gregory Gombas
> > Sent: Sunday, August 26, 2007 5:38 PM
> > To: Cisco certification
> > Subject: IE Lab9 Task 1.7 L2 Tunnel
> >
> > The task requires you to connect two switches via a layer 3
> > etherchannel by tunneling through another switch in the middle.
> >
> > The solution states to use this config on the middle switch:
> > switchport mode dot1q-tunnel
> > l2protocol tunnel cdp
> >
> > My question is why are they using a dot1q-tunnel when the end switches
> > are not even using dot1q encapsulation (they are layer 3 ports)?
> > I was able to get this working simply with the l2protocol tunnel
> > command on the middle switch with the ports in access mode.
> >
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