topic Re: IGMP block access to switches in Switching and Routing

IGMP block access to switches

moelharrak — Sun, 06 Dec 2020 13:18:12 GMT

Hi ,

I have an IGMP configured on a HP switches that stream channels.

The solution was working fine until a day when we noticed that image on TVs start freewing in only some switches , and when that happen the switches become unvailable and we can not ping them or access them, sometimes the ping works with more than 2000 ms of response time which is a lot.

CS conneced to SW1 and then SW2,SW3 and SW4 are connected to SW1

CS config is configured as follow:

vlan xxx
name "TV"
tagged 1-24
ip address 192.168.1.1 255.255.255.0
ip igmp
ip igmp querier interval 7
exit

SW1 is configuration:

vlan xxx
name "TV"
untagged 10,20-22
tagged 24-28
no ip address
ip igmp
exit

SW2 , SW3 and SW4 Configuration is:

vlan xxx
name "TV"
tagged 11,13,18,21,24-28
no ip address
ip igmp
no ip igmp querier
no ip igmp fastleave 25-28 *** for Uplink ports***
ip igmp forcedfastleave 11,13,18,21,24 ***for TVs ports****
exit

Any idea what can cause this issue?

Thank you

Re: IGMP block access to switches

jmpk — Tue, 08 Dec 2020 02:15:57 GMT

Hello @moelharrak

Are you seeing any log messages at the time when image starts freezing ?

When you say switch is unavilable what do you mean exactly ? is the swich went down ?

Are you seeing any spanning tree related log in switch ?

It will be helpful if you share logs from the switch which has issue

Re: IGMP block access to switches

moelharrak — Tue, 08 Dec 2020 15:19:02 GMT

Thank you for your reply,

No I don't see any kind of error in the logs

Also there is no STP enabled.

What I mean by we lose access to the switches :is that the switches SW3 , SW4 and SW5 that I mentioned before they become hard to access them, ping time out or more than 2000ms ,

Re: IGMP block access to switches

jmpk — Fri, 11 Dec 2020 01:43:41 GMT

Hi @moelharrak

You said that you didn't enabled the STP , I could understand that the SW1-4 connected in a ring.

Just wanted to know how you are managing L2 the network if there is any loop in it ? Did you received any recommendtaion not to use STP ?

Re: IGMP block access to switches

moelharrak — Fri, 11 Dec 2020 13:58:33 GMT

Hi ,

Thank you for your reply.

I don't see any loop in the network. Please see the Topology. If there is a loop than it will be global.

Please note that WIFI VLAN configured on Core-Switch, SW1, SW2 and SW3 is working fine.

Configuration of IPTV VLAN is as follow:

CS-IPTV-Provider:

vlan XXX
name "IPTV"
untagged 4
tagged 25-28
ip address 192.168.1.1 255.255.255.0
ip igmp
ip igmp querier interval 7
exit

SW-IPTV-Provider:

vlan XXX
name "IPTV"
untagged 1-23
tagged 24-28
no ip address
ip igmp
exit

SW1,SW2 and SW3:

vlan XXX
name "IPTV"
tagged 11,13,18,21,24-28
no ip address
ip igmp
no ip igmp fastleave 25-28
ip igmp forcedfastleave 11,13,18,21,24
no ip igmp querier
exit

Thank you

Re: IGMP block access to switches

jmpk — Sun, 13 Dec 2020 05:42:02 GMT

Hi @moelharrak

Since its required complete log analysis , i suggest you to log case with HPE support for quicker resolution.