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

[Adam Greene]

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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>