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

[Steven Pfister]

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