On 13 November 2014 at 16:41, Dave Bell <[email protected]> wrote: > > Hi James, > > You only advertise the L2TP endpoints for the local LNSs out of the > specific hostlink. IE only advertise your Manchester endpoints out of > your Manchester hostlink. If there is no route, then they can't > establish a connection. > > Also I believe its fairly typical to run the part of the network that > interconnects with BT over the hostlinks in a separate routing > instance. > > Regards, > Dave > > On 13 November 2014 14:12, James Bensley <[email protected]> wrote: > > Hi All, > > > > I received some very helpful answers last time I asked here so I'm > > back again. A combination of the BT SIN docs and WBMC help desk have > > filled in all various blanks for me: > > > > BGP MED is not used any further that the point of interconnect with > > BTW for WBMC host links and AS-Paths greater than 1 aren't allowed. > > So... > > > > Those of you with multiple host links to BTW, if you have a > > north/south/east/west host link and LNS' in all those locations, how > > do you ensure that BTW direct all your L2TP tunnels to your east LNS > > via your east host link, and that they prefer your southen host link > > to reach your southen LNS IP ranges? > > > > I'm trying to avoid the scenario of BT establishing L2TP tunnels to an > > LNS in London via a host link in Manchester, with our LNS then sending > > the return traffic out of our London host link because that is closer > > to the London LNS. I'd like the traffic paths to be more predicatable > > for failure sencarios and more liner to monitor etc etc. > > > > Cheers, > > James.
Hi Dave, Yeah not ideal though, as per my original post I'd prefer all LNS routers to be available via all host-links such that we can load balance users across all LNS' even when a host-link is down. Since BT don't want to support anything usable in BGP we just used a variety of prefixes lengths so at Manchester for example we send /32s for tunnel end points up there and in the London the same tunnel end points are advetised in /29's and vice verse for each location. Does the job but I want to keep it a bit cleaner. Cheers, James.
