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Title: Multicast service pause or pixilation occur [Print this page]

Author: Crystal Time: 2018-4-9 10:25
Title: Multicast service pause or pixilation occur

When multicast is enabled in the network,the PC can demand the multicast service. However, pause or pixilation mayoccur.

Author: admin Time: 2018-4-9 19:16
Possible Causes

1) Packet loss occurs on interfaces or links.

2) Congestion occurs on switches.

Troubleshooting Steps

Step1: Check the topology connections.

Check the following items:

- Interfaces between the server and theswitches

- IP address and MAC address of the server

- Interfaces between the switches and theirIP addresses

- Interfaces between the PC and theswitches

- IP address and MAC address of the PC

- IP address of the gateway

Step2: Check whether packet loss occurs on interfaces.

show interfaces counters //Display the counterof error packets on each interface to check whether error packets such asFCSErrors increase continuously. If packet loss occurs on the hardware, replacethe interface and network cable to check whether the fault is rectified. Usethis method to check whether the next-hop switch is faulty.

Step3: Check whether congestion occurs on interfaces.

show interfaces counters rate //Checkwhether the rates at the ingoing and outgoing directions of each interfaceexceed the interface bandwidth. If yes, check whether the interface traffic isnormal and whether any attack occurs.

Step4: Check whether GE interfaces send packets to FEinterfaces.

Since GE interfaces are connected with theswitches while FE interfaces are connected with PCs, PCs may not able to processmulticast packets and therefore pixilation occurs. If it happens, enable flowcontrol on the interfaces and check whether the fault is rectified.

Note: Flow control takes effect only whenit is enabled on the devices at both ends.

Step 5: Check the flow control status oninterfaces.

In multicast scenarios, enable flow controlon interfaces to prevent untimely packet processing in the case of greattraffic.

Step5:Fault Information Collection

Collect fault information by running thefollowing commands, record all operation logs and packet capture information,and report them to Ruijie technical support.

show version

show version slots

show run

show log

show ip interface brief

show interface status

show interface counter sum

show interface counter rate

show interfaces counters errors

show interfaces counters

show arp counter

show arp

show cpu

show cpu-protect mb

show cpu-protect

show cpu-protect slot X //X indicates the slot ID. For example, run showcpu-pro slot 4 to display information of Slot 4 on the standalone server S86E;run show cpu-pro slot 2/4 to display information of Slot 4 on Cabinet 2 of theVSU system.

show cpu-protect slot X //X indicates the slot ID. For example, runshow cpu-pro slot 4 to display information of Slot 4 on the standalone server S86E;run show cpu-pro slot 2/4 to display information of Slot 4 on Cabinet 2 of theVSU system.

show spanning-tree

show spanning-tree summary

2. Collect information about multicastentries.

In PIM-DM mode, run the following commandsto collect information:

show ip pim dense-mode mroute

show ip pim dense-mode neighbor

show ip pim dense-mode interface

show ip mvif

show ip pim dense-mode track

In PIM-SM mode, run the following commandsto collect information:

show ip pim sparse-mode mroute

show ip pim sparse-mode neighbor detail

show ip pim sparse-mode interface

show ip mvif

show ip pim sparse-mode rp mapping

show ip pim sparse-mode bsr-router

show ip pim sparse-mode track

On the access switches, run the followingcommands to collect information:

show ip igmp snooping

show ip igmp snooping gda-table

show ip igmp snooping interfaces

show ip igmp snooping mrouter

show ip igmp snooping querier

show ip igmp snooping statistics

show ip igmp profile

show msf nsf

show msf msc

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