standard HDLC over IP network - how?

[narcis antonie]

Hello, i need some help.

I have an equipment that has its output as standard layer 2 HDLC and i need to transport that HDLC over an IP network. At destination i need the HDLC intact, the IP network must be transparent. How can i do that?

Thanks in advance.

[narcis antonie]

P.S.: All elements of the IP network are under my control.

[Richard Burts]

Narcis

You do not provide much detail about your network environment.Cisco has introduced a feature called Circuit Emulation over IP that sounds like it would do what you need. See this link for an explanation of the feature and some advice about how to configure it:

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t7/feature/guide/bbfeamod.html

HTH

Rick

[narcis antonie]

Basicaly i have 2 cisco 3700 series routers conected via fastethernet. The routers also have one wic2t module each. I need to connect the HDLC interface (it has V.24 electrical interface with DB25 rs232 jack) of the equipment that i spoke about to one of the wic2t ports on one router and transport that HDLC to the other router on one of its wic2t ports.

The equipment that generates HDLC does not have the posibility to assign an ip address on the HDLC interface (it is only layer 2 ISO/OSI HDLC).

I can't use the CEoIP because I don't have the NM-CEM-4SER or the NM-CEM-4TE1 module.

[paolo bevilacqua]

You can try STUN for that.

Configuration is described in the manual.

[Giuseppe Larosa · Accepted solution]

Hello Antonie,

with C3700 I have used L2TPv3. This protocol can transport FR or HDLC frames over an IP network on a point to point service between two routers

see

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t2/feature/guide/gtl2tpv3.html

It supports also transport of HDLC frames

it is supported since 12.3T

I have tested it with FR or carrying 802.1Q tagged frames with good results.

Edit:

what Paolo suggests is a different way to perform tunneling. The idea is that you need a form of tunneling.

I don't see the need for circuit emulation here as the requirement is to transport L2 frames.

Hope to help

Giuseppe

[narcis antonie]

I guess this is the answer. i will try it out tomorow and if it works i will post here. thanks a lot.

[narcis antonie]

the l2tpv3 worked well. thanks.