From: Leo Lin (linyileo@gmail.com)
Date: Mon Apr 23 2007 - 14:12:51 ART
Hi,
I have few question about your configuration.
The first question is which one is the dr of R3,R6 or R3,R7 and how many
interface running multicast in R6 and R7?
Because the dr is responding for send register to RP, yes, there is not MA
network, but dr is still responding for it. If R6 and R7 just enable
multicast on the frame-relay interface, the multicast flow just generate on
.30 network, and need dr handle it. To solve this problem, use ip pim
dr-priority.
The second is ip nbma-mode should enable on R3, because need to fixed the
prune override failure problem as Shamin said.
If still have problem, now come to the third. I remember I have been
encounter this problem before, it is the IOS version bug, it is not relate
to the multicast, it is relate to the ping. Try this step to figure out.
First enable debug ip pim on R1,R4,R3,R6, ping 224.1.1.1 re 99 from R6(must
R3 be DR), you should be noticed there are register receive on R1, and send
join to (R6,group), R6 should receive these. Now multicast flow will come
down from R6, but it may be stop at somewhere. Then use ip accounting to
figure out where it is stop. You can enable ip accounting out on output
interface(data flow direction), and ip accounting-list 224.1.1.1 0.0.0.0 on
global. Then you will find which router cause this problem. By my guest, it
is R4. I remember the last time I solve this problem with acl log. I try to
log the ping packet and it suddenly solve the problem, I don!/t know why and
haven!/t send the case to cisco. Try add this acl on input interface which
cause the problem: acces 101 per icmp an an echo log, acces 101 per icmp an
an echo-reply log, access 101 per ip an an.
Sometimes you can use SLA to check it except ping too.
If you still find there is problem, feel free to contact me and attach the
debug ip pim, ip accounting, and icmp log result.
HTH
Leo
-----SJ<~T-<~-----
7"<~HK: nobody@groupstudy.com [mailto:nobody@groupstudy.com] 4z1m Shamin
7"KMJ1<d: 2007Dj4TB23HU 1:16
JU<~HK: iyux2000@gmail.com
3-KM: ccielab@groupstudy.com
VwLb: Re: Multicast problem, help needed
Hi,
Do you have the ip nbma-mode on R3 FR interface, If it is a Multipoint
interface.
Everything else looks normal to me.
Regards
Shamin
On 4/22/07, iyux2000@gmail.com <iyux2000@gmail.com> wrote:
>
> Hi, group
>
> I'am working on a topology as follows. All routers join in OSPF area 0.
> R1 is the RP for group 224.1.1.1, and R1 joins 224.1.1.1 group on
> loopback0.
> I'am using AUTORP sparse-dense-mode, R4 is MA.
>
>
> R1(s0.1 p2p) (s0/0)R6
> \ /
> FR--(s0/2.1 multipoing)R4(fa0/1)--(fa3/0)R3(s0/1) - FR
> | \
> R2 (s0/0.1
> p2p) (s0/1)R7
>
> After i configured, i have following situations:
>
> R3,R6 and R7 can not ping 224.1.1.1, but they can receive the correct
> mapping informations in "show ip pim rp mapping".
> But sh ip mroute 224.1.1.1 on R3:
> R3#sh ip mroute 224.1.1.1
>
> (*, 224.1.1.1), 00:00:26/stopped, RP 8.8.1.1, flags: SP
> Incoming interface: FastEthernet3/0, RPF nbr 8.8.20.4
> Outgoing interface list: Null
>
> (8.8.20.4, 224.1.1.1), 00:00:26/00:02:33, flags: PT
> Incoming interface: FastEthernet3/0, RPF nbr 0.0.0.0
> Outgoing interface list: Null
>
> (8.8.30.3, 224.1.1.1), 00:00:15/00:03:23, flags: T
> Incoming interface: Serial0/1, RPF nbr 0.0.0.0
> Outgoing interface list:
> FastEthernet3/0, Forward/Sparse-Dense, 00:00:15/00:03:14
>
> The incoming interface and outgoing interface pair looks fine.
>
> R3#sh ip pim rp mapp
> PIM Group-to-RP Mappings
>
> Group(s) 224.1.1.1/32
> RP 8.8.1.1 (?), v2v1
> Info source: 8.8.4.4 (?), elected via Auto-RP
> Uptime: 00:13:00, expires: 00:02:48
>
> The mapping info on R3 also looks fine.
>
> R6 and R7 has the same problems as R3.
>
> What's wrong in my network, i'am wondering if i hit a IOS bug or
> something?
>
> Any recommedations and suggestions are highly appreciated. If you need
> more information for troubleshooting, please let me know.
>
> Thank you very much for your kindly help.
>
> Cheers.
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Tue May 01 2007 - 08:28:37 ART