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Networking
As shown in Figure 1-1, Eth-Trunk3 is created between Switch-1 and Switch-2, and Eth-Trunk20 is created between Switch-2 and Switch-3. An Eth-Trunk is created between Switch-2 and the NE40E. Eth-Trunk1 is located on Switch-2, and Eth-Trunk1.43 is located on the NE40E.
Figure 1-1 Networking diagram for the fault that the IPTV service is abnormal after a switch is powered off and reset
Fault Symptom
After Switch-2 restarts, users connected to the OLT encounter abnormal IPTV services and cannot watch live TV programs.
Cause Analysis
The interface Eth-Trunk20 of Switch-2 receives PIM Hello packets from other interfaces and forwards them to the NE40E. In this case, the NE40E does not become the PIM DR, and traffic cannot be imported to the connected OLT. As a result, users cannot watch multicast programs.
Troubleshooting Procedure
Step 1 Simulate users' multicast requests in the OLT. It is found that multicast entries can be generated on Switch-1 in a short period.
<Switch-1> display
igmp-snooping port-info verbose
The port information of Group 239.16.10.6 on VLAN 43:
Time of this group has been up : 00:00:06
The port information of (0.0.0.0, 239.16.10.6):
Time of this source has been up : 00:00:06
Port Table on this source(0.0.0.0):
No.1
Port name : Eth-Trunk10
Time of this port has been up as a host-port : 00:00:06
Remain time of port expire as dynamic host-port : 00:02:06
Host-port flags : Dynamic
Step 2 Log in to the NE40E and check the downstream interface Eth-Trunk1.43. It is found that there are five PIM neighbors and the PIM DR of VLAN 43 is not the NE40E. Therefore, the NE40E cannot import multicast traffic to the OLT.
<NE40E> display pim neighbor
VPN-Instance: public net
Total Number of Neighbors = 11
Neighbor
Interface Uptime Expires Dr-Priority
BFD-Session
219.150.177.33 GE1/1/0
32w:5d 00:01:39
1 N
219.150.179.173 GE1/1/1 32w:5d
00:01:45 1 N
219.150.177.133 GE2/1/0 32w:5d
00:01:38 1 N
219.150.179.13 GE2/1/1
32w:5d 00:01:20
1 N
10.138.12.1 Eth-Trunk1.43 3d:09h 00:01:45
1 N
10.138.10.1 Eth-Trunk1.43 3d:09h 00:01:45
1 N
10.138.6.1 Eth-Trunk1.43 3d:09h
00:01:45 1 N
10.137.244.1 Eth-Trunk1.43 3d:09h 00:01:45
1 N
10.138.8.1 Eth-Trunk1.43 3d:09h
00:01:45 1 N
Step 3 Log in to Switch-2 and print debugging information. It is found that PIM Hello packets with five different source IP addresses are received from Eth-Trunk20.
*43.3358195201 Switch-2
SNPG/7/PACKET:Received Packet (protocol = 103) from 10.138.8.1 to 224.0.0.13,
type 0x20 on (VLAN 43 Eth-Trunk20 ) (SNPG_INIT2161)
*43.3358195202 Switch-2 SNPG/7/QUERY:Received hello packet with unsupported
option: 65004,option ignored (SNPG_ROUTER1175)
*43.3358195202 Switch-2 SNPG/7/QUERY:Received pim hello packet.
(SNPG_ROUTER1194)
*43.3358195203 Switch-2 SNPG/7/PACKET:Received a pim hello Packet from 10.138.8.1
to 224.0.0.13 (SNPG_INIT2220)
*43.3358195204 Switch-2 SNPG/7/PACKET:Received Packet (protocol = 103) from
10.137.244.1 to 224.0.0.13, type 0x20 on (VLAN 43 Eth-Trunk20 )
(SNPG_INIT2161)
*43.3358195212 Switch-2 SNPG/7/QUERY:Received hello packet with unsupported
option: 65004,option ignored (SNPG_ROUTER1175)
*43.3358195212 Switch-2 SNPG/7/QUERY:Received pim hello packet.
(SNPG_ROUTER1194)
*43.3358195213 Switch-2 SNPG/7/PACKET:Received a pim hello Packet from
10.137.244.1 to 224.0.0.13 (SNPG_INIT2220)
*43.3358195214 Switch-2 SNPG/7/PACKET:Received Packet (protocol = 103) from
10.138.12.1 to 224.0.0.13, type 0x20 on (VLAN 43 Eth-Trunk20 ) (SNPG_INIT2161)
*43.3358195214 Switch-2 SNPG/7/QUERY:Received hello packet with unsupported
option: 65004,option ignored (SNPG_ROUTER1175)
*43.3358195215 Switch-2 SNPG/7/QUERY:Received pim hello packet.
(SNPG_ROUTER1194)
*43.3358195215 Switch-2 SNPG/7/PACKET:Received a pim hello Packet from
10.138.12.1 to 224.0.0.13 (SNPG_INIT2220)
*43.3358195216 Switch-2 SNPG/7/PACKET:Received Packet (protocol = 103) from
10.138.10.1 to 224.0.0.13, type 0x20 on (VLAN 43 Eth-Trunk20 ) (SNPG_INIT2161)
*43.3358195217 Switch-2 SNPG/7/QUERY:Received hello packet with unsupported
option: 65004,option ignored (SNPG_ROUTER1175)
*43.3358195217 Switch-2 SNPG/7/QUERY:Received pim hello packet.
(SNPG_ROUTER1194)
*43.3358195218 Switch-2 SNPG/7/PACKET:Received a pim hello Packet from
10.138.10.1 to 224.0.0.13 (SNPG_INIT2220)
*43.3358195219 Switch-2 SNPG/7/PACKET:Received Packet (protocol = 103) from 10.138.6.1
to 224.0.0.13, type 0x20 on (VLAN 43 Eth-Trunk20 ) (SNPG_INIT2161)
*43.3358195219 Switch-2 SNPG/7/QUERY:Received hello packet with unsupported
option: 65004,option ignored (SNPG_ROUTER1175)
*43.3358195220 Switch-2 SNPG/7/PACKET:Received a pim hello Packet from
10.138.6.1 to 224.0.0.13 (SNPG_INIT2220)
Step 4 Check Switch-2. It is found that there are two multicast upstream interfaces in VLAN 43. Eth-Trunk20 was generated three days ago.
<Switch-2> display
igmp-snooping router-port vlan 43
Port Name UpTime
Expires Flags
---------------------------------------------------------------------
VLAN 43, 2 router-port(s)
Eth-Trunk1 15w:5d
00:01:35 DYNAMIC
Eth-Trunk20 3d:09h 00:01:23
DYNAMIC
Step 5 Check the Eth-Trunk20 configuration on Switch-2. Run the undo port trunk allow-pass vlan 43 command to remove VLAN 43 to restore the current service.
[Switch-2-Eth-Trunk20] display
this
#
interface Eth-Trunk20
port link-type trunk
undo port trunk allow-pass vlan 1
port trunk allow-pass vlan 43 46 51 54 70 87 90 to 92 95 to 96 501 to 772
885 to 899
traffic-policy tttt outbound
undo port trunk allow-pass vlan 43
----End
