All things related to multicast

["Marshall Eubanks" <>]

Unfortunately, I have to go to a meeting ASAP, so I will have to look at this 
in detail 
tonight. Here s some remote info you probably already know.

Marsha;;

We see no SA's from you , but we do from ampath. MBGP from you looks fine.

multicasttech-1>show ip msdp sa | include 5786
multicasttech-1>show ip msdp sa | include 20080
(198.32.252.58, 233.4.200.18), RP 198.32.252.193, MBGP/AS 20080, 
5d01h/00:05:16

Neither beacon is visible

multicasttech-1>show ip mroute 233.4.200.19 136.145.128.147
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report, s - SSM
Outgoing interface flags: H - Hardware switched
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 233.4.200.19), 7w0d/00:02:59, RP 206.61.163.252, flags: SJC
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    FastEthernet1/0, Forward/Sparse, 00:53:57/00:02:19

multicasttech-1>show ip mroute 233.4.200.19 136.145.54.40  
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report, s - SSM
Outgoing interface flags: H - Hardware switched
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 233.4.200.19), 7w0d/00:02:59, RP 206.61.163.252, flags: SJC
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    FastEthernet1/0, Forward/Sparse, 00:56:00/00:02:10



On Tue, 13 Sep 2005 14:30:01 -0400
 William Caban 
<>
 wrote:
> Well, here it is.
> 
> UPR: University of Puerto Rico
> 
> Setup Scenario
> ===========
> 
> We have a Cisco GSR serving all our campuses and this is the one that is 
> doing the peering with Ampath for I2 services. On unicast we only 
> advertise /24s of those campuses that are part of the University and not 
> the /16 of our main class (136.145/16) since we have (for historic 
> reasons) private entities being which Internet services are serve by 
> this class (we are working on fixing that). On multicast we just 
> advertise the whole /16 since these external private entities are not 
> multicast enable anyway.
> 
> (AMPATH/I2)-----[GSR at UPR]----(UPR I2 institution)
>                                     \-----[7600 a] -------- (other 
> smaller UPR institutions)
>                                                   \-------------[7600 b] 
> ---- (Internet - Local Carrier)
>                                                                         
> \----- (private entities)
> 
> 
> So here I'll be referring to the GSR, UPR I2 institutions and the "7600 a".
> 
> 
> Actual information
> =============
> 
>  From the GSR I have an MBGP peering with AMPATH in which I advertise 
> the 136.145/16 plus the Arecibo's Observatory Networks, the output for 
> this part:
> 
> GSR12406#sh ip mbgp neighbors 198.32.252.209 advertised-routes
> BGP table version is 988206, local router ID is 136.145.215.50
> Status codes: s suppressed, d damped, h history, * valid, > best, i - 
> internal,
>               r RIB-failure, S Stale
> Origin codes: i - IGP, e - EGP, ? - incomplete
>  
>    Network          Next Hop            Metric LocPrf Weight Path
> *> 136.145.0.0      0.0.0.0                            32768 i
> *> 192.65.176.0     136.145.215.18           0         32768 ?
> *> 192.231.93.0     136.145.215.18           0         32768 ?
> *> 192.231.95.0     136.145.215.18           0         32768 ?
> 
>  From the GSR I also have an msdp peering with AMPATH, the UPR I2 
> campuses that want Multicast and to the 7600:
> 
> GSR12406#sh ip msdp summary
> MSDP Peer Status Summary
> Peer Address     AS    State    Uptime/  Reset SA    Peer Name
>                                 Downtime Count Count
> 198.32.252.33    20080 Up       3w0d     2     2724  gsr.ampath.net
> 136.145.215.14   65003 Down     00:00:05 0     0     
> rrp2hpcf.hpcf.upr.edu  !They were down on this snapshot
> 136.145.215.6    65002 Up       6d00h    1     0     rcm2hpcf.hpcf.upr.edu
> 136.145.215.49   5786  Up       4d22h    0     0     gw7600.hpcf.upr.edu
> 
> Now, I seen on the beacon (http://beacon2.ncsa.uiuc.edu/) that the two 
> beacons, on two different campuses are behaving quite different:
> 
> ciar-mcast.rcm.*upr*.*edu (*136.145.128.147) >> connected on a campus, 
> mostly have multicast connectivity
> wisepiont.hpcf.upr.edu (136.145.54.40) >> connected to the 7600, have no 
> multicast connectivity
> 
> The IGMP on the 7600 look like this:
> 
> 7609#sh ip igmp groups 233.4.200.18
> IGMP Connected Group Membership
> Group Address    Interface                Uptime    Expires   Last Reporter
> 233.4.200.18     Vlan2                    4d19h     00:02:01  136.145.54.40
> 7609#
> 
> 7609#sh ip mroute 233.4.200.18 136.145.54.40 count
> IP Multicast Statistics
> 12 routes using 8100 bytes of memory
> 8 groups, 0.50 average sources per group
> Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per 
> second
> Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
>  
> Group: 233.4.200.18, Source count: 2, Packets forwarded: 5158036, 
> Packets received: 5158036
>   Source: 136.145.54.40/32, Forwarding: 5158036/13/55/6, Other: 5158036/0/0
> 7609#
> 
> 
> Now on the GSR I get this:
> 
> GSR12406#sh ip mroute 233.4.200.18 136.145.54.40 count
> IP Multicast Statistics
> 161 routes using 77456 bytes of memory
> 9 groups, 16.88 average sources per group
> Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per 
> second
> Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
>  
> Group: 233.4.200.18, Source count: 51, Group pkt count: 9603068
>   Source: 136.145.54.40/32, Forwarding: 0/-12/0/0, Other: 5158454/0/5158454
> 
> 
> What does "-12" means!? How can I forward packets in neg? The RPF for 
> this network on these routes look like this:
> 
> GSR12406#sh ip rpf 136.145.54.40
> RPF information for wisepoint.hpcf.upr.edu (136.145.54.40)
>   RPF interface: GigabitEthernet1/2
>   RPF neighbor: ? (136.145.215.54)
>   RPF route/mask: 136.145.54.0/24
>   RPF type: unicast (ospf 5786)
>   RPF recursion count: 0
>   Doing distance-preferred lookups across tables
> GSR12406#
> 
> RPF information for wisepoint.hpcf.upr.edu (136.145.54.40)
>   RPF interface: Vlan2
>   RPF neighbor: ? (136.145.54.40) - directly connected
>   RPF route/mask: 136.145.54.0/24
>   RPF type: unicast (connected)
>   RPF recursion count: 0
>   Doing distance-preferred lookups across tables
> 7609#
> 
> At the beacon page wisepoint.hpcf.upr.edu (136.145.54.40) is clasified 
> as a Blind Beacon. The other machine, ciar-mcast.rcm.*upr*.*edu* 
> (136.145.128.147) from time to time disappear from beacons like 
> *.indiana.edu.
> 
> Where in the configuration do I start looking for possible explanations?
> 
> 
> Thanks in advance,
> 
> --William Caban
> 
> William Caban wrote:
> 
> > I need help debugging our multicast (University of Puerto Rico). I 
> > remember I did the multicast configuration back in 2002 and basically 
> > haven't touch it since then. Lately we have been having various 
> > strange behavior where in a short period of time (an hour) people see 
> > us from some places and then it stops. I've try my best and I think it 
> > should be working (but clearly is not). Will this be a forum for this 
> > type of questions to post more detailed information? or, can anyone 
> > point me to the right forum?
> >
> >
> > Thanks in advance,
> >
> > William Caban
> >
>