From: Brian Hescock (bhescock@xxxxxxxxx)
Date: Wed Oct 24 2001 - 09:26:43 GMT-3
Ok, dumb question I know, but I have to ask (I've learned never to assume
anything): can you unicast ping the router that you're trying to get a respons
e
from via multicast? I just want to make sure we have connectivity. Several
other items:
- I would assume you're using "ip igmp join-group x.x.x.x" and not "ip igmp
static-group x.x.x.x" on the router? The router will only respond if using
join-group, not static-group
- Is the join-group command on the outbound interface on the router in question
?
It won't work if it's on an incoming interface. PIM enabled on the pertinent
interfaces? ip multicast-routing configured (pim will work without
multicast-routing being enabled, multicast traffic just won't be routed
(forwarded).
- do a debug ip mpacket on the next-hop router from where you're doing the ping
(use "no ip mroute-cache" on the interfaces so you can see the debugs). Do you
see the multicast packets come in?
- if you don't see the debugs, do "show ip mroute x.x.x.x", do you see the (S,G
)
(source ip, multicast group) entry?
- if you see the (S,G) for the group, do "show ip mroute x.x.x.x count" and loo
k
at the counters for the group. You should see the "forward" value incrementing
,
repeat the command to see if it does. Also, check the last three values (there'
s
two sets of values, four in the first set I believe and three in the second set
),
you should see the first value incrementing but not the second one (at least n
ot
by much, if using dense mode you will see it increment a few packets every thre
e
minutes when we flood out every interface, resulting in rpf failures on some of
the interfaces).
- keep going router by router and see at what point we don't have an entry othe
r
than null in the outbound interface list.
Should it still not work, go to enable mode and capture "show tech ipmulticast"
and send me the output from the various routers will the ping is in progress.
Note: ipmulticast is one word in the command. Thanks,
Brian
Michael Wong wrote:
> Yes, CGMP was enabled ... here is an output from the CAT below
>
> CAT> (enable) sh multicast group
> CGMP enabled
> IGMP disabled
> GMRP disabled
>
> VLAN Dest MAC/Route Des [CoS] Destination Ports or VCs / [Protocol Type]
> ---- ------------------ ----- ------------------------------------------
-
> 11 01-00-5e-00-01-27 2/7,2/24
> 11 01-00-5e-00-01-28 2/7,2/24
> 11 01-00-5e-00-05-05 * 2/7,2/24
>
> Total Number of Entries = 3
>
> CAT> (enable) ping 224.0.5.5
> no answer from 224.0.5.5
>
> .... and success from the router.
>
> r5#ping 224.0.5.5
>
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 224.0.5.5, timeout is 2 seconds:
>
> Reply to request 0 from 200.100.100.13, 200 ms
> Reply to request 0 from 200.100.100.13, 316 ms
> Reply to request 0 from 200.100.100.13, 300 ms
> Reply to request 0 from 200.100.100.13, 216 ms
>
> -----Original Message-----
> From: Khalid Nafie [mailto:knafie@ncr.com.kw]
> Sent: Wednesday, 24 October 2001 7:45 pm
> To: Michael Wong; Groupstudy - CCIELAB (E-mail)
> Subject: RE: ccBootCamp Lab 20 - Multicast
>
> did u try to enable cgmp on the CAT
>
> -----Original Message-----
> From: Michael Wong [mailto:Michael.Wong@nec.com.au]
> Sent: Wednesday, October 24, 2001 1:16 AM
> To: Groupstudy - CCIELAB (E-mail)
> Subject: ccBootCamp Lab 20 - Multicast
>
> Hey Group
>
> I am having a problem with Section Three Task Seven, Question 3. I have
> setup R13 to join to an IGMP group and the IP address 224.0.5.5 is pingable
> from all multicast routers ... no problem there. However this question also
> states that the CAT should be able to ping this address also ?? Is this
> possible .... has anyone got this to work. Keep in mind that the CAT is able
> to ping all unicast addressees in the network.
>
> I tried placing a static CAM entry for the multicast MAC address to see what
> happens but no joy ..... Help please .... TIA
>
> MW :)
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