[c-nsp] STP in L2TPv3

[Chris Flav]

I am having a devil 
of a time getting spanning-tree packets to work over a functional L2TPv3 
tunnel.  I can see arp, cdp, SSDP, and all sorts of other garbage traffic over 
the link, DHCP works, Internet, the works.
 
However, if I 
connect a catalyst switch on each end and send STP, I do not see the 
spanning-tree packets on the remote end of the link.
 
I am using Cisco 
800-series routers (cheating by reversing the Fe4 and Vlan1 ports) and as 
stated, the L2TPv3 tunnel is reliable and functional, with the exception of 
STP.  Is there something fundamental I am missing?  See below 
configs;
 
 
SiteA:
======
l2tp-class 
l2-dyn
 authentication
 hostname MTL
 password 7 
071B29495E08
 cookie size 8
!
!
pseudowire-class 
pw-dynamic
 encapsulation l2tpv3
 protocol l2tpv3 l2-dyn
 ip local 
interface Vlan1
!
!
!
interface FastEthernet4
 no ip 
address
 duplex auto
 speed auto
 no cdp enable
 xconnect 66.xxx.xxx.xxx 1 
encapsulation l2tpv3 pw-class pw-dynamic
!
interface 
Vlan1
 ip address 66.xxx.xxx.xxx 255.255.255.192
 no ip 
proxy-arp
 
 
show l2tun session 
all
 
L2TP Session 
Information Total tunnels 1 sessions 1
 
Session id 61551 is 
up, tunnel id 735
  Remote session id is 21103, remote tunnel id 25982
  
Locally initiated session
Call serial number is 2414100001
Remote tunnel 
name is SHE
  Internet address is 66.xxx.xxx.21
Local tunnel name is 
MTL
  Internet address is 66.xxx.xxx.195
IP protocol 115
  Session is 
L2TP signaled
  Session state is established, time since change 00:09:59
  
DF bit off, ToS reflect disabled, ToS value 0, TTL value 255
  UDP checksums 
are disabled
  Session cookie information:
    local cookie, size 8 bytes, 
value CB 2A 48 48 59 BA 49 A5
    remote cookie, size 8 bytes, value 0D F2 0A 
CF 7A ED 2A B4
  FS cached header information:
    encap size = 32 
bytes
    45000014 00000000 FF73347F 429E81C3
    42818015 0000526F 
0DF20ACF 7AED2AB4
 
    1327 Packets 
sent, 12 received
    119801 Bytes sent, 1295 received
  Last clearing of 
counters never
  Counters, ignoring last clear:
    1327 Packets sent, 12 
received
    119801 Bytes sent, 1295 received
    Receive packets 
dropped:
      out-of-order:             0
      total:                    
0
    Send packets dropped:
      exceeded session MTU:     0
      
total:                    0
  Sequencing is off
  Conditional debugging is 
disabled
  Unique ID is 1
Session Layer 2 circuit, type is Ethernet, name 
is FastEthernet4
  Session vcid is 1
  Circuit state is UP
    Local 
circuit state is UP
    Remote circuit state is UP
 
 
 
 
 
 
SiteB:
=====
 
l2tp-class 
l2-dyn
 authentication
 hostname SHE
 password 7 14031A0E1C0
 cookie 
size 8
!
!
pseudowire-class 
pw-dynamic
 encapsulation l2tpv3
 protocol l2tpv3 l2-dyn
 ip local 
interface Vlan1
!
!
interface 
FastEthernet4
 no ip address
 duplex auto
 speed auto
 no cdp 
enable
 xconnect 66.xxx.xxx.195 1 encapsulation l2tpv3 pw-class 
pw-dynamic
!
interface 
Vlan1
 ip address 66.xxx.xxx.21 255.255.255.0
 no ip 
proxy-arp
 
show l2tun session 
all
 
L2TP Session 
Information Total tunnels 1 sessions 1
 
Session id 21103 is 
up, tunnel id 25982
  Remote session id is 61551, remote tunnel id 735
  
Remotely initiated session
Call serial number is 15905
Remote tunnel name 
is MTL
  Internet address is 66.xxx.xxx.195
Local tunnel name is SHE
  
Internet address is 66.xxx.xxx.21
IP protocol 115
  Session is L2TP 
signaled
  Session state is established, time since change 00:12:43
  DF 
bit off, ToS reflect disabled, ToS value 0, TTL value 255
  UDP checksums are 
disabled
  Session cookie information:
    local cookie, size 8 bytes, 
value 0D F2 0A CF 7A ED 2A B4
    remote cookie, size 8 bytes, value CB 2A 48 
48 59 BA 49 A5
  FS cached header information:
    encap size = 32 
bytes
    45000014 00000000 FF73347F 42818015
    429E81C3 0000F06F 
CB2A4848 59BA49A5
 
    14 Packets sent, 
1607 received
    1415 Bytes sent, 145299 received
  Last clearing of 
counters never
  Counters, ignoring last clear:
    14 Packets sent, 1607 
received
    1415 Bytes sent, 145299 received
    Receive packets 
dropped:
      out-of-order:             0
      total:                    
0
    Send packets dropped:
      exceeded session MTU:     0
      
total:                    0
  Sequencing is off
  Conditional debugging is 
disabled
  Unique ID is 1
Session Layer 2 circuit, type is Ethernet, name 
is FastEthernet4
  Session vcid is 1
  Circuit state is UP
    Local 
circuit state is UP
    Remote circuit state is UP
 
 
 
Any 
ideas?!


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