Hi all,
I'm labbing Vol1 Lab 25,
I'm having an issue with the ping from R1 and R5 to address 227.0.0.44 joined
on F0/0 of R4, the ping from R2 works. I've double-checked all the configs and
restarted the lab from scratch but I can't figure out why the ping doesn't work.
I can ping from R1 and R5 to 226.0.0.66, the address of group joined by R6 f0/0.
This is the output I get on R2:
*** ping from R1 to 226.0.0.66
R2#
*Mar 1 00:30:15.591: IP(0): s=200.0.0.1 (FastEthernet0/0) d=226.0.0.66
(Serial1/0.26) id=85, ttl=254, prot=1, len=100(100), mforward
*** ping from R1 to 227.0.0.44
R2#
*Mar 1 00:30:59.471: IP(0): s=200.0.0.1 (FastEthernet0/0) d=227.0.0.44 id=86,
ttl=254, prot=1, len=114(100), mroute olist null
*** sh ip mroute on R2
R2#sh ip mroute 226.0.0.66
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,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 226.0.0.66), 00:20:20/stopped, RP 200.0.0.2, flags: SP
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list: Null
(200.0.0.1, 226.0.0.66), 00:01:35/00:02:40, flags: TA
Incoming interface: FastEthernet0/0, RPF nbr 150.50.12.1
Outgoing interface list:
Serial1/0.26, Forward/Sparse, 00:01:35/00:02:53
(200.0.0.2, 226.0.0.66), 00:03:19/00:00:10, flags: T
Incoming interface: Loopback0, RPF nbr 0.0.0.0
Outgoing interface list:
Serial1/0.26, Forward/Sparse, 00:03:19/00:03:07
R2#sh ip mroute 227.0.0.44
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,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 227.0.0.44), 00:01:54/stopped, RP 200.0.0.2, flags: SP
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list: Null
(200.0.0.1, 227.0.0.44), 00:01:54/00:01:05, flags: PTA
Incoming interface: FastEthernet0/0, RPF nbr 150.50.12.1
Outgoing interface list: Null
*** ping from R2 to 227.0.0.44
I don't understand why the ping from R2 works since it reports "mroute olist
null" but the packet reaches R4:
R2#ping 227.0.0.44
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 227.0.0.44, timeout is 2 seconds:
*Mar 1 00:41:10.599: IP(0): MAC sa=**Unknown SNPA type** (Loopback0)
*Mar 1 00:41:10.599: IP(0): IP tos=0x0, len=100, id=10, ttl=254, prot=1
*Mar 1 00:41:10.599: IP(0): s=200.0.0.2 (Loopback0) d=227.0.0.44 id=10,
ttl=254, prot=1, len=100(100), mroute olist null
Reply to request 0 from 150.50.24.1, 92 ms
R4#
*Mar 1 00:50:36.915: IP(0): s=200.0.0.2 (Serial0/0.24) d=227.0.0.44
(FastEthernet0/0) id=24, ttl=254, prot=1, len=100(100), mforward
MSDP peers, BGP peers with both ipv4 and multicast address family are up. Tried
to remove ip multicast boundary acl. IP reachability is full.
RPF on R4 is good:
R4#sh ip rpf 200.0.0.2
RPF information for ? (200.0.0.2)
RPF interface: Serial0/0.24
RPF neighbor: ? (150.50.24.2)
RPF route/mask: 200.0.0.2/32
RPF type: mbgp
RPF recursion count: 0
Doing distance-preferred lookups across tables
R4#sh ip rpf 200.0.0.1
RPF information for ? (200.0.0.1)
RPF interface: Serial0/0.24
RPF neighbor: ? (150.50.24.2)
RPF route/mask: 200.0.0.1/32
RPF type: mbgp
RPF recursion count: 0
Doing distance-preferred lookups across tables
Need help to understand, thanks.
Gian Paolo
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