Switches, Hubs, and Modems
cancel
Showing results for 
Search instead for 
Did you mean: 

IGMP between 2 4108gl

Michel Caissie
Occasional Visitor

IGMP between 2 4108gl


Hi,

I have the following problem in a Procurve switched environment, when running multicast traffic between two Procurve 4108gl

Here is the scenario ;

Switch A = 4108gl - IGMP enable with normal priority

Switch B = 4108gl - connected to Switch A - IGMP enable with normal priority

Switch C = 2524 - connected to Switch A - IGMP enable


Server A is connected on Switch A

Station B is connected on Switch B
Station C is connected on Switch C

We run a Ghost Console on Server A ( for multicasting image on stations)

When we run a multicast from Server A to Station B ( between both 4108gl ) , the multicast traffic seems to take a very high priority since no other
traffic is working. We can't even telnet the switch . As soon as the multicast is over we get full connectivity back.

Another strange thing is if we multicast on Station C ( between a 4108gl and a 2524 ), the multicast traffic takes normal priority and other types of traffic
keeps working, but if we look in Switch A , we can see that the multicast traffic occurs not only on the port connecting the 2524 ( wich is normal since Station C participate in the multicast) , but the multicast traffic occurs also on the port connecting the other 4108gl , even if there is no station participing in the multicast on this other switch.

The only igmp command applied in all switches is ip igmp , the rest is by default .


So the question is , is there a specific configuration to put in the 4108gl to get this working properly ?

thanks

Michel Caissie


Switch A

Image Size(Bytes) Date Version
----- ---------- -------- -------
Primary Image : 2588998 04/19/02 G.05.02
Secondary Image : 2588998 04/19/02 G.05.02
Boot Rom Version: G.05.01
Current Boot : Primary


vlan 1
name "DEFAULT_VLAN"
untagged A1-A3,B1-B3,H1-H24
ip address 172.22.0.3 255.255.252.0
ip igmp
exit


Status and Counters - IP Multicast (IGMP) Status

VLAN ID : 1
VLAN Name : DEFAULT_VLAN

Active Group Addresses Reports Queries Querier Access Port
---------------------- ------- ------- -------------------
224.0.1.24 31085 31084 A3
229.55.150.208 31085 31084 A3
235.80.68.83 31085 31084 A3
239.255.255.254 31085 31084 A3



IGMP Service

VLAN ID VLAN NAME IGMP Enabled Forward with High Priority Querier Allowed
------- ------------ ------------ -------------------------- ---------------
1 DEFAULT_VLAN Yes No Yes


Switch B

Image Size(Bytes) Date Version
----- ---------- -------- -------
Primary Image : 2588998 04/19/02 G.05.02
Secondary Image : 2588998 04/19/02 G.05.02
Boot Rom Version: G.05.01
Current Boot : Primary

vlan 1
name "DEFAULT_VLAN"
untagged A1-A3,B1-B24,C1-C24,D1-D24,E1-E24,F1-F24,G1-G6,H1-H6
ip address 172.22.0.4 255.255.252.0
ip igmp
exit

VLAN ID : 1
VLAN Name : DEFAULT_VLAN

Active Group Addresses Reports Queries Querier Access Port
---------------------- ------- ------- -------------------
224.0.1.24 24931 0
229.55.150.208 24931 0
235.80.68.83 24931 0
239.255.255.254 24931 0



IGMP Service

VLAN ID VLAN NAME IGMP Enabled Forward with High Priority Querier Allowed
------- ------------ ------------ -------------------------- ---------------
1 DEFAULT_VLAN Yes No Yes



3 REPLIES
Ron Kinner
Honored Contributor

Re: IGMP between 2 4108gl

There is a command in command line mode which lets you set the priority. It says it's an interface Vlan command so I assume it goes something like:

int vlan1
no ip igmp high-priority-forwarding

That should fix your not being able to do anything else while multicasting.

The other problem I expect requires that you make each switch a querier. There is a command line option for that too but I am having trouble reading the damn pdf manual from HP. Everytime i try to read it it hangs IE.

Once you do that you may need to read:

http://www1.ietf.org/mail-archive/working-groups/magma/current/msg00048.html

Ron
Michel Caissie
Occasional Visitor

Re: IGMP between 2 4108gl

Hi Ron,

thanks for your answer ,

Regarding the priority it's already set for normal.It's not easy to read in the message , but in the IGMP Service part of the show tech

"
IGMP Service

VLAN ID VLAN NAME IGMP Enabled Forward with High Priority Querier Allowed
------- ------------ ------------ -------------------------- ---------------
1 DEFAULT_VLAN Yes No Yes "

The first Yes is for IGMP enable;
The No is for Forward with High Priority;
The third Yes is for Querier Allowed

But i may try to reset this by enabling High Priority and disabling it back.

Regarding the Querier options , i think only one switch is elected as a Querier within all the switch in the network that are willing to take the job. Maybe both 4108 are trying to act as a Querier . I gona disalow Querier on Switch B and see if it do any good.

-Michel
Michel Caissie
Occasional Visitor

Re: IGMP between 2 4108gl

Problem resolved:

After applying

no vlan 1 ip igmp querier on Switch B , the problem disapeared .

After allowing Switch B again to act as a Querier the problem did not reapear.

So there must have been some problem previously in the election of the Querier between the 2 4108gl .

So i wont take any chance , i'll just allow my main Switch to act as a Querier to prevent similar problems in the futur

-Michel