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mlppp dot1q question

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paul at paulstewart

Nov 26, 2009, 6:10 AM

Post #1 of 7 (1018 views)
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mlppp dot1q question

Hey guys...

Is there any way to run subinterfaces across a MLPPP bundle in IOS?

thanks,

Paul

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justin at justinshore

Nov 26, 2009, 7:57 AM

Post #2 of 7 (978 views)
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Re: mlppp dot1q question [In reply to]

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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paul at paulstewart

Nov 26, 2009, 8:19 AM

Post #3 of 7 (976 views)
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Re: mlppp dot1q question [In reply to]

Thanks very much .. that gives me what I was looking for unfortunately ;)

Paul

-----Original Message-----
From: Justin Shore [mailto:justin [at] justinshore]
Sent: November-26-09 10:57 AM
To: Paul Stewart
Cc: cisco-nsp [at] puck
Subject: Re: [c-nsp] mlppp dot1q question

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/conf
iguration/6500series/76cfgt1.html#wp1159581
http://www.cisco.com/en/US/docs/interfaces_modules/shared_port_adapters/conf
iguration/7600series/76cfgsip.html#wp1182134
http://www.cisco.com/en/US/docs/ios/bridging/configuration/guide/br_bcp_ps10
591_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_ps69
22_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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koug at intracom

Nov 26, 2009, 9:03 AM

Post #4 of 7 (988 views)
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Re: mlppp dot1q question [In reply to]

>
> Is there any way to run subinterfaces across a MLPPP bundle in IOS?
>

maybe you could also use eg l2tpv3 over mlppp or frame-relay with
frf.16.1 and DLCIs?

Haven't tried it though...

John
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gert at greenie

Nov 26, 2009, 10:13 AM

Post #5 of 7 (979 views)
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Re: mlppp dot1q question [In reply to]

Hi,

On Thu, Nov 26, 2009 at 09:57:11AM -0600, Justin Shore wrote:
> >
> >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).

One could use its more recent incarnation - EoMPLS. Which works across
MLPPP "mostly fine" - that is, EoMPLS requires CEF, and there have been
nasty bugs with CEF and MLPPP in the past (we haven't bitten ourselves
but from what I saw on the list here).

But with a recent IOS this should work.

gert
--
USENET is *not* the non-clickable part of WWW!
//www.muc.de/~gert/
Gert Doering - Munich, Germany gert [at] greenie
fax: +49-89-35655025 gert [at] net

eric at atlantech

Nov 27, 2009, 7:56 AM

Post #6 of 7 (974 views)
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Re: mlppp dot1q question [In reply to]

> -----Original Message-----
> From: cisco-nsp-bounces [at] puck [mailto:cisco-nsp-
> bounces [at] puck] On Behalf Of Paul Stewart
> Sent: Thursday, November 26, 2009 9:11 AM
> To: cisco-nsp [at] puck
> Subject: [c-nsp] mlppp dot1q question
>
> Hey guys...
>
>
>
> Is there any way to run subinterfaces across a MLPPP bundle in IOS?
>

I would imagine that your best bet is to use a Ethernet over T1 device like the RICi-8T1 from RAD (watch for wrap):

http://www.rad.com/10/Mid_band_Ethernet_and_Fast_Ethernet_over_Eight_T1_NTU/2429/

You can bundle up to 8 T1s through MLPPP and transport VLANs across the link.

-evt
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perc69 at gmail

Nov 30, 2009, 12:50 AM

Post #7 of 7 (919 views)
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Re: mlppp dot1q question [In reply to]

Hi.

> maybe you could also use eg l2tpv3 over mlppp or frame-relay with frf.16.1
> and �DLCIs?
>
> Haven't tried it though...

We are using MLFR (FRF 16.1) in a quite large scale with great
success. No bugs have bitten us so far, neither on the PE-side (12.0S
on GSR) or CPE (ISR's running different 12.4 flavours).

--
Pelle
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