VoIP Dual Serial Links

[christian.testa]

I've got a cust with 2x2MB serial links connecting two offices. I'll be using a gatekeeper.. Is it best to multilink voice traffic or have one link for voice and the other for data? Are there links to assist with configuration?

[DRAGI RADOVANOVIC]

Christian,

whether you should designate links for voice and data I guess depends on the number of calls that will be going across the wan. If you are going to have 2 voice calls at max then you would waste a lot of bandwidth if you separate your links.

With LLQ and multilink you would never have a wasted bit of bandwidth, so you should really go with mlppp (this is just how I would do it).

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094660.shtml

Dragi

[christian.testa]

Dragi,

Thank you that is good.

Actually the WAN link is being presented at 2x2MB Ethernet, can I still use MLPPP?

Regards,

Christian

[DRAGI RADOVANOVIC]

No,

I don't know of any way to do mlppp over ethernet (or at least none that I have tested).

In order to load balance between the two links your best bet is to use IP CEF per-packet load sharing.

See how it works with voice, but Cisco doesn't recommend it (http://www.ciscotaccc.com/iprout/showcase?case=K77444097). Why not change the 2 links to just 1 4mb connection?

Dragi