Re: mcast over frame topology not working - I am all out of

Make sure your hub is the PIM DR.

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Marko Milivojevic - CCIE #18427
Senior Technical Instructor - IPexpert
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On Fri, Sep 10, 2010 at 18:49, Ladee Geek <ladeegeek_at_gmail.com> wrote:
> I'm trying to determine why I'm not getting a response to a multicast
> ping over a frame-relay hub (r3) and spoke (r4) when traffic is originated
> from one hop away from the hub frame relay router. B But I am getting it to
> work when originated from the hub? B  I have been trying debug ip
> packet and debug ip mpacket on R4 the spoke. Then I realized it would be
> unicast. Right? B The odd thing is that I'm seeing mpacket counts go up when
> traffic is sourced from the hub R3. B So wait, will it be unicast or mcast
> over the pvc?
>
> I'm not seeing a single mpacket on R4 when debuging mpacket on serial
> interface when the traffic is originated from either R5 or R3. The mpacket
> count only increases when traffic origniates from the hub, R3. B Not at all
> when originiated from R5.
>
> I am getting ping responses to 226.6.6.6 from R4 B when traffic originates on
> R3, but not when originated from R5. B Yes, R4 passes the rpf check for
> 156.2.35.5.
>
> *Topology*
>
> r5 - (PPPoF virtual-template) r3 , then r3 (frame relay) to both r2 and r4.
> R5 originates the mcast stream to 226.6.6.6 from 156.2.35.5
>
>
> I'm having a hell of a time debuging this even with an acl on "debug ip
> packet." B Since R3 is going to unicast this, will the source be the
> originating source (for this lab R5) or does r3 change the source address?
>
> I'm going to focus on R4 since both hubs are having the same issue.
>
> *multicast source R5:*
>
> R5# show int virtual-tem 35
> B interface Virtual-Template35
> B ip address 156.2.35.5 255.255.255.0
> B ip pim dense-mode
> B no peer neighbor-route
>
> R5#sho ip pim neig
> PIM Neighbor Table
> Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
> B  B  B P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
> Neighbor B  B  B  B  B Interface B  B  B  B  B  B  B  B Uptime/Expires B  B Ver B  DR
> Address B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B Prio/Mode
> 156.2.35.3 B  B  B  B Virtual-Access2 B  B  B  B  B 02:03:30/00:01:15 v2 B  B 1 / S P G
>
>
> *hub R3:*
>
> R3# show int virtual-tem 35
> interface Virtual-Template35
> B ip address 156.2.35.3 255.255.255.0
> B ip pim dense-mode
> B no peer neighbor-route
>
> interface Serial0/0/0
> B ip address 156.2.234.3 255.255.255.0
> B ip load-sharing per-packet
> B ip pim dense-mode
> B no ip mfib forwarding output
> B encapsulation frame-relay
> B frame-relay map ip 156.2.234.3 304
> B frame-relay map ip 156.2.234.4 304 broadcast
> B frame-relay map ip 156.2.234.2 302 broadcast
> B no frame-relay inverse-arp
>
> R3#sho ip pim neig
> PIM Neighbor Table
> Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
> B  B  B P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
> Neighbor B  B  B  B  B Interface B  B  B  B  B  B  B  B Uptime/Expires B  B Ver B  DR
> Address B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B Prio/Mode
> 156.2.234.4 B  B  B  Serial0/0/0 B  B  B  B  B  B  B 02:16:42/00:01:17 v2 B  B 1 / DR S
> P G
> 156.2.234.2 B  B  B  Serial0/0/0 B  B  B  B  B  B  B 02:16:47/00:01:44 v2 B  B 1 / S P G
> 156.2.35.5 B  B  B  B Virtual-Access1 B  B  B  B  B 02:01:22/00:01:25 v2 B  B 1 / S P G
>
>
> *Spoke R4:*
>
> R4#sr int s 0/0/0.234
> !
> interface Serial0/0/0.234 point-to-point
> B ip address 156.2.234.4 255.255.255.0
> B ip pim dense-mode
> B ip nat inside
> B no ip mfib forwarding output
> B ip virtual-reassembly
> B frame-relay interface-dlci 4
>
> R4#sho ip rpf 156.2.35.5
> RPF information for ? (156.2.35.5)
> B RPF interface: Serial0/0/0.234
> B RPF neighbor: ? (156.2.234.3)
> B RPF route/mask: 156.2.35.0/24
> B RPF type: unicast (rip)
> B Doing distance-preferred lookups across tables
> B RPF topology: ipv4 multicast base, originated from ipv4 unicast base
>
> R4#sho ip mroute
> IP Multicast Routing Table
> Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
> B  B  B  L - Local, P - Pruned, R - RP-bit set, F - Register flag,
> B  B  B  T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
> B  B  B  X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
> B  B  B  U - URD, I - Received Source Specific Host Report,
> B  B  B  Z - Multicast Tunnel, z - MDT-data group sender,
> B  B  B  Y - Joined MDT-data group, y - Sending to MDT-data group,
> B  B  B  V - RD & Vector, v - Vector
> Outgoing interface flags: H - Hardware switched, A - Assert winner
> B Timers: Uptime/Expires
> B Interface state: Interface, Next-Hop or VCD, State/Mode
> (*, 226.6.6.6), 00:00:13/00:02:46, RP 0.0.0.0, flags: DCL
> B Incoming interface: Null, RPF nbr 0.0.0.0
> B Outgoing interface list:
> B  B Serial0/0/0.234, Forward/Dense, 00:00:13/00:00:00
> B  B  Loopback104, Forward/Dense, 00:00:13/00:00:00
>
> R4#sho ip pim neig
> PIM Neighbor Table
> Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
> B  B  B P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
> Neighbor B  B  B  B  B Interface B  B  B  B  B  B  B  B Uptime/Expires B  B Ver B  DR
> Address B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B  B Prio/Mode
> 156.2.234.3 B  B  B  Serial0/0/0.234 B  B  B  B  B 02:10:51/00:01:44 v2 B  B 1 / S P G
>
>
> * Ping testing from R5 and the show commands on R4:*
>
>
> ping from R5 - Notice that R4 doesn't register a mpacket being recieved.
>
> R5#pin 226.6.6.6 source 156.2.35.5
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 226.6.6.6, timeout is 2 seconds:
> Packet sent with a source address of 156.2.35.5
> Reply to request 0 from 3.3.3.3, 72 ms
>
> R4#sho ip mrout count
> IP Multicast Statistics
> 2 routes using 1312 bytes of memory
> 2 groups, 0.00 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: 226.6.6.6, Source count: 0, Packets forwarded: 0, Packets received: 0
> Group: 224.0.1.40, Source count: 0, Packets forwarded: 0, Packets received:
> 0
>
> * Ping testing from R3 and the show commands on R4:*
>
> ping from R5 - Notice that R4 registers a mpacket being recieved.
>
> B Ping from R3
> R3#ping 226.6.6.6
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 226.6.6.6, timeout is 2 seconds:
> Reply to request 0 from 3.3.3.3, 4 ms
> Reply to request 0 from 156.2.104.1, 104 ms
> Reply to request 0 from 156.2.102.1, 92 m
>
> R4#sho ip mrout count
> IP Multicast Statistics
> 3 routes using 1656 bytes of memory
> 2 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: 226.6.6.6, Source count: 1, Packets forwarded: 1, Packets received: 1
>
> B Source: 156.2.234.3/32, Forwarding: 1/0/100/0, Other: 1/0/0
> Group: 224.0.1.40, Source count: 0, Packets forwarded: 0, Packets received:
> 0
>
>
> *i'm really not sure what else to do here or how to figure out just what the
> problem is. B r3 and r5 are clearly pim neighbors, the mpacket clearly goes
> from r5 to r3. B But I don't understand what is happening after that. B debug
> ip mpacket on r4 does not display a sinlge mpacket (mroute-cache is turned
> off on R4 ser 0/0/0.234).*
>
>
> *HELP!*
>
> --
> r/
> LG
>
>
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