802.3ad/LACP between Administrative Domains

Chris Costa ccosta25686 at mac.com
Mon Sep 25 15:41:18 UTC 2006

We have a GE link to another SP and bridge a single VLAN ID to connect 
multiple hosts on each side.  We'd like to increase the BW between the 
two networks, but the other provider cannot support upgrading to 10GE.  
What are the issues w/ running 802.3ad LACP between two separately 
managed networks and binding Nx1GE links:

- Does this require BPDU forwarding across the links, and share a 
common STP for the VLAN?  We currently filter BPDU's across the single 

- Any known LACP negotiation issues between a Cisco (6500) and Foundry 

- Is there the potential for layer 2 loops if LACP fails and BPDU's are 
being filtered across the links?

- Bad experiences w/ 802.3ad when loosing one of the two links?

Thank you for your input.

More information about the NANOG mailing list