Re: Was multicast routing behavior changed in new 15.0T code?

Hi Armin,

Thanks for taking the time for looking and responding to this query. The
racks I use for studying were upgraded to 15.0 code two weeks ago. Those
have the full license set, I'm sure of it.
My question however is more focused on the actual behavior, which looks like
it has been changed. It looks like you have to disable Multicast CEF for the
routers to learn the RP mappings, and also a tunnel interface is now
created. At least this is what I observed while going thru this exercise,
but I am just curious to know if anybody has tried this and what are the
outcomes.

Thanks,
Jorge

On Mon, Aug 16, 2010 at 6:08 PM, Armin Mirsepassi <amirsepassi_at_ccgrp.com>wrote:

> Jorge,
>
> 15.x Quick read faq:
>
> http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps10587/ps10591/p
> s10621/qa_c67_561940.html<http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps10587/ps10591/p%0As10621/qa_c67_561940.html>
>
> I havnt bought or used 15.x with ISR Gen 1, I will take a risk and assume
> it's the same as with Gen 2, unless im missing something. Look at pictures
> in below ordering doc for a little better explanation of the license
> features, pretty much same as above.
>
> http://www.cisco.com/en/US/prod/collateral/modules/ps10598/ordering_guide_c0
> 7_557736_ps10537_Products_Data_Sheet.html<http://www.cisco.com/en/US/prod/collateral/modules/ps10598/ordering_guide_c0%0A7_557736_ps10537_Products_Data_Sheet.html>
>
> Otherwise use the feature navigator tool (http://www.cisco.com/go/fn) to
> make sure everything you need is available with the licenses you have
> purchased.
>
> If you're using for studies you can request a temp 60 day license
> (http://www.cisco.com/go/license click temp license link at top of page)
>
> Armin
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Jorge Cortes
> Sent: Monday, August 16, 2010 1:06 PM
> To: Cisco certification
> Subject: Was multicast routing behavior changed in new 15.0T code?
>
> Hi GS Gurus.
>
> Just ran into an strange issue with multicast routing where the router
> wasn't getting the RP mapping information. The topology is very simple as
> it
> is a daisy chain and no RPF failures:
>
> SW---SW(RP)---SW---R
>
> Router interface configuration
>
> interface FastEthernet0/1
> ip address 61.61.128.193 255.255.255.224
> ip pim sparse-mode
> ip ospf mtu-ignore
> duplex auto
> speed auto
> ipv6 address 2001:61:100::4/64
> ipv6 rip RIPNG enable
> !
>
> R4(config)#do sh ip pim rp map
> PIM Group-to-RP Mappings
>
> R4(config)#
>
> So I turned on "debug ip mpacket" on the router to see what was going on,
> and also tried to disable "mroute cache" as follows:
>
> R4(config)#int fa0/1
> R4(config-if)#no ip mroute-ca
> The above command is going to be deprecated. Use MFIB commands instead.
>
> Well, looks like this command is not supported anymore, so lets use the new
> MFIB commands.
>
> R4(config-if)#no ip mfib ?
> cef Multicast CEF to/from interface
> forwarding Multicast forwarding to/from interface
>
> Not sure the difference between both, so will disable both. The final
> configuration of the interface looks as follows:
>
> interface FastEthernet0/1
> ip address 61.61.128.193 255.255.255.224
> ip pim sparse-mode
> no ip mfib forwarding input
> no ip mfib forwarding output
> no ip mfib cef input
> no ip mfib cef output
> ip ospf mtu-ignore
> duplex auto
> speed auto
> ipv6 address 2001:61:100::4/64
> ipv6 rip RIPNG enable
> !
>
> And right after I'm done with that configuration -which was suppossed to be
> used only for debugging purposes- I get the following message:
>
> R4(config-if)#
> *Aug 15 22:54:16.490: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Tunnel0, changed state to up
>
> And now the RP mappings appear to be working:
>
> R4(config-if)#do sh ip pim rp map
> PIM Group-to-RP Mappings
>
> Group(s) 239.10.5.0/24
> RP 150.1.9.9 (?), v2v1
> Info source: 150.1.10.10 (?), elected via Auto-RP
> Uptime: 00:01:52, expires: 00:02:05
>
> Not sure what exactly is going on with the new code, but I had never seen
> this before. First looks like the behavior is now like in IPv6 multicast,
> where a tunnel interface is created, but I don't understand why it was
> necessary to turn off MFIB for it to work.
>
> Is anybody aware of this behavior? I couldn't find it documented.
>
> R4(config-if)#do sh ver
> Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version
> 15.0(1)M2, RELEASE SOFTWARE (fc2)
>
> Thanks,
>
> Jorge
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Mon Aug 16 2010 - 21:57:32 ART