[c-nsp] STP in L2TPv3
Ge Moua
moua0100 at umn.edu
Sat Mar 13 00:55:07 EST 2010
I had a case open with Cisco on this same issue pending for 6 months or
so then I finally closed the ticket; what I saw was basically the STP
pkts was arriving out-of-order due to fragmentation; the remote end
never get STP updates as such.
I've been meaning to test this with EoMPLS over GRE to see if STP
behaves the same way; one funny thing I did see though that if I turned
off the PXF engine on the head-end, then STP gets transmiitted then
frrag/defrag properly; down side is that PXF engine provides for
enhanced throughput of L2TPv3 (which is very CPU intensive if process
switched); in the end Cisco TAC advised us to run VTP domain in
transparent mode so as not to pass STP pkts; that's what we are doing now.
If I get around to testing STP updates on EoMPLS over GRE then I'll post
my results on this distro list; good luck.
--
Regards,
Ge Moua
Network Design Engineer
University of Minnesota | OIT - NTS
2218 University Ave SE
Minneapolis, MN 55414-3029
Email: moua0100 at umn.edu | Office: 612.626.2779
--
Chris Flav wrote:
> 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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