Multicast & Broadcast Loop Detection and Resolution
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03-22-2019 10:26 PM
Dear Experts,
Our company found IP phone call choppy sounds, Cisco IP phone autoreboot, ACD agent phone auto-logout and call drop, slower network access since last Friday. Our vendors has checked the followings:
1. WAN links utilization is normal
2. Switches CPU utilization is not high
3. Wireshark traces intermittent HSRP multicasts from routers / server broadcast burst
4. Some switchports flashing at the same time frequently
5. Switchports is set with auto-qos & voice packets have been tagged with EF
6. IPT system should be working normally
Can any body can advise me how to identify looping source and how to resolve the looping issue? Please enlighten.
Thanks.
Anthony
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LAN Switching
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03-22-2019 11:28 PM
- Activate syslogging to a central server on all your switches , look for weird error messages afterwards.
M.
-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '
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03-23-2019 02:16 AM
Adding to other post :
1. Firsrt i will look before Friday what were the major changes done in the network. (if all working as expected before Friday problem reported)
2. i will review the config with the base config with current config any changes.
3. when was the last time the devices are rebooted or patched ?
4. Good to have high level topology for us to look how your network and where the issue going to be.
5. also provide evidence of logs and config
waiting for input further asistance to provide,.
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03-23-2019 04:18 AM
Hello
How many devices are you talking about?
Are you ruining any multicast applications
Do you have any storm control/port security applied to the access switches ports?
Please rate and mark as an accepted solution if you have found any of the information provided useful.
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Kind Regards
Paul
