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New Member

LLDP (Layer 2 protocol) tunneling not working

Hi,

we are using a WS-C3750-48TS as a transparent switch for multiple separated networks. Now the switch shall also forward incoming LLDP frames to the appropriate egress ports. Therefore i have added the command "l2protocol-tunnel lldp" to each interface, where this feature is needed. So my configuration looks like (excerpt):

...
spanning-tree mode pvst
spanning-tree extend system-id
no spanning-tree vlan 1,4051-4062
!
vlan internal allocation policy ascending
!
vlan 4051-4062
!
interface FastEthernet1/0/1
 switchport access vlan 4051
 switchport mode dot1q-tunnel
 l2protocol-tunnel lldp
 no keepalive
 no cdp enable
!
interface FastEthernet1/0/2
 switchport access vlan 4051
 switchport mode dot1q-tunnel
 l2protocol-tunnel lldp
 no keepalive
 no cdp enable
!
...

I have tested this setup with SW version c3750-ipbasek9-mz.122-55.SE8 and c3750-ipbasek9-mz.122-55.SE9. The result was that no incoming LLDP frames have been counted by the switch (checked with "show l2protocol-tunnel") and also no LLDP frames have been forwarded. As a countercheck i have done the same procedure with STP (l2protocol-tunnel stp) and CDP (l2protocol-tunnel cdp), which was successful. So in principial the L2 tunneling is working but not for LLDP. Do i need to add something in addition in the configuration? Or is there a SW version which is known to work correctly? Or is this not fully implemented since LLDP tunneling is not explicitly mentioned in user manual?

Best regards
Benjamin

  • LAN Switching and Routing
2 REPLIES

Hi, You can check the cisco

Hi,

 

You can check the cisco feature navigator to find with your requirement.

 

http://www.cisco.com/c/en/us/support/switches/catalyst-3750-series-switches/tsd-products-support-series-home.html?referring_site=bodynav

 

I believe 12.2.55SE version of IOS supports that. But better if you could search in that tool and findout with the requirement,

for 12.2.55SE

New Member

Can someone explain the

Can someone explain the difference between l2protocol forward <> and l2protocol tunnel <> ?? how are the packets edited on the ingress and egress PE nodes ??

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