[c-nsp] Question on 802.1q trunks and L2TPv3

[Steven Pfister]

Yes, I knew that was a problem, but wasn't sure which way to go.

Is there any way to do this by changing the router instead? The 10.77.0.0/16 is supposed to be part of the 77 vlan. I'm hoping to be able to do this remotely (the site has limited access hours). The router is the nearer device and the switch is behind it (from the central site's point of view).

Thanks!

Steve Pfister
Technical Coordinator, 
The Office of Information Technology
Dayton Public Schools
115 S. Ludlow St. 
Dayton, OH 45402
 
Office (937) 542-3149
Cell (937) 673-6779
Direct Connect: 137*131747*8
Email spfister at dps.k12.oh.us


>>> "Adam Greene" <maillist at webjogger.net> 7/7/2008 9:24 AM >>>
Steven,

Right now you have 10.77.0.0/16 on vlan 1 on the router but on vlan 77 on 
the switch.

If you want the switch to use an IP address from the 10.77.0.0/16 block, you 
have to include vlan 1 as the native vlan on the 3550, and put the 
10.77.0.10 address on vlan 1 rather than vlan 77.

Thanks,
Adam


----- Original Message ----- 
From: "Steven Pfister" <SPfister at dps.k12.oh.us>
To: <cisco-nsp at puck.nether.net>
Sent: Monday, July 07, 2008 8:35 AM
Subject: [c-nsp] Question on 802.1q trunks and L2TPv3


> I've got a 3640 router that's connected to a 3550 switch. The trunking is 
> set up as dynamic desirable, and I need to change it to be a dot1q trunk. 
> I'm having a little trouble getting that done. I tried doing a:
>
> switchport trunk encapsulation dot1q
> switchport mode trunk
>
> and the switch became unreachable. Do I need to add something like:
>
> switchport trunk native vlan 77
>
> ?
>
> Parts of the config are included below...
>
> Thanks!
>
>
>
> router
> -------
> interface FastEthernet0/0
> no ip address
> no ip redirects
> no ip proxy-arp
> ip pim sparse-mode
> ip route-cache flow
> speed 100
> full-duplex
> !
> interface FastEthernet0/0.1
> encapsulation dot1Q 1 native
> ip address 10.77.0.1 255.255.0.0
> no snmp trap link-status
> no cdp enable
> !
> interface FastEthernet0/0.77
> encapsulation dot1Q 77
> no snmp trap link-status
> no cdp enable
> xconnect 192.168.7.1 77 pw-class pw-dynamic
>
>
> Switch
> --------
> interface FastEthernet0/48
> switchport access vlan 77
> switchport mode dynamic desirable
> speed 100
> duplex full
> spanning-tree portfast
> !
> interface Vlan77
> ip address 10.77.0.10 255.255.0.0
> !
> ip default-gateway 10.77.0.1
>
>
> Steve Pfister
> Technical Coordinator,
> The Office of Information Technology
> Dayton Public Schools
> 115 S. Ludlow St.
> Dayton, OH 45402
>
> Office (937) 542-3149
> Cell (937) 673-6779
> Direct Connect: 137*131747*8
> Email spfister at dps.k12.oh.us 
>
>
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