Paul Stewart wrote:
Hey guys...
Is there any way to run subinterfaces across a MLPPP bundle in IOS?
I'm assuming that you want to carry a couple VLANs down a MLPPP bundle,
correct? If so then one solution is called BCP (Bridge Control
Protocol). It's a fairly old protocol. When I researched it I found
references to it in the early 12.x code docs. You probably don't want
to consider it though. Command #1 in any config guide you find is 'no
ip routing'. That's right; you have to disable routing on your router
to use it. We were evaluating the Overture ISG 140/180 Ethernet of
bonded DS1 product when we came across it. The OV SE told us that sure
it interopted nicely with MLPPP on a 7200. What he didn't mention was
that you also had to use BCP, effectively cutting the legs out from
under our router. If you happen to have an old 7200 with an older CPU
sitting around then you have a nice platform to work with. If you don't
and the router you spent big $$$ is also doing routing (fancy that) you
probably don't want to use BCP.
On a side note, I recall while searching for data on BCP that it's also
possible on platforms that use SPAs. If memory serves me correctly you
don't have to disable routing on those platforms. On those platforms
you can literally apply switchport commands to the Serial interfaces.
It looked very slick but we didn't have SPA-capable hardware in that POP
to work with at the time so it wasn't a solution for us.
Search cisco.com for BCP and you'll find some docs.
http://www.cisco.com/en/US/docs/interfaces_modules/shared_port_adapters/configuration/6500series/76cfgt1.html#wp1159581
http://www.cisco.com/en/US/docs/interfaces_modules/shared_port_adapters/configuration/7600series/76cfgsip.html#wp1182134
http://www.cisco.com/en/US/docs/ios/bridging/configuration/guide/br_bcp_ps10591_TSD_Products_Configuration_Guide_Chapter.html
http://www.cisco.com/en/US/docs/ios/12_3t/12_3t2/feature/guide/gt_bcp.html
http://www.cisco.com/en/US/docs/ios/bridging/configuration/guide/br_bcp_ps6922_TSD_Products_Configuration_Guide_Chapter.html
Or are you asking if it's possible to break a MLPPP bundle of a couple
DS1s into a couple different MLPPP bundles while still maintaining some
manner of link redundancy when spanned across the 2 (or more) DS1s? If
that's the case then you could look at creating multiple channel-groups
in the controller config. Say for example
t1 10 channel-group 0 timeslots 1-12
t1 10 channel-group 1 timeslots 13-24
t1 11 channel-group 0 timeslots 1-12
t1 11 channel-group 1 timeslots 13-24
Then put Se1/0/10:0 and Se1/0/11:0 into a MLPPP bundle and Se1/0/10:1
and Se1/0/11:1 into a separate MLPPP bundle. The downside is that there
is no sharing of bandwidth between the 2 unique bundles.
Best of luck
Justin
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