Service Guard cluster generate ICMP traffic?

[Christopher LaPlante_1]

Does the heartbeat or any other traffic between service guard cluster generate ICMP traffic?

[Jeff Schussele]

Hi Christopher,

Yes, I believe heartbeats are ICMP traffic.
We use a private LAN for all our heartbeats to avoid network congestion (or network modifications) from preventing proper heartbeating.

Rgds,
Jeff

[Hai Nguyen_1]

I believe the heartbeat does. But it should not cause any network traffic problem since the communications is going on only between the servers within the cluster on heartbeat interfaces.

Hai

[Christopher LaPlante_1]

I figured the heartbeat private lan generated ICMP traffic. Do the other interfaces configured also serve as heartbeats lans?

[Hai Nguyen_1]

By default, one of the package interfaces is configured as a backup heartbeat LAN JUST IN CASE there is some commnunication problem over the default heartbeat LAN.

Hai

[Jeff Schussele]

AFAIK, only if you configure the cluster to use a primary IP as a heartbeat IP.
As I stated earlier we don't like to do so as nothing is more frustrating than a congested subnet causing pkg failovers or TOCs.

My $0.02,
Jeff

[Steven E. Protter · Accepted solution]

Any machine in default 11.00 configuration thats up and alive on the network will generate icmp traffice according to this information.

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xdb8170647922904583e3df5373c394e4,00.html

I don't know Service Guard but I think the heartbeat generates ADDITIONAL ICMP traffic.

The machines in your cluster are all in the same subnet right?

SEP

[Massimo Bianchi]

Hi,
AFAIK all subnet are used as hearbeat, when you specify the clause HEARTBEAT_IP immediatly after their declaration.

Otherwise they won't be used as heartbeats.

Massimo

[Massimo Bianchi]

I mean, if you do not want cluster traffic (don't know if ICMP or NOT), specify a lan interface as
STATIONARY_IP


from "man cmquerycl"

HEARTBEAT_IP The heartbeat IP address. This is the IP address
to be used for sending heartbeat messages.

STATIONARY_IP This is the IP address dedicated to the node.
This IP address will stay with the node and will
not be moved.



i rememebr that this is also discussed in the manual, but last time i read it was 3 years ago...

Massimo

[Christopher LaPlante_1]

Thanks for all the replies. Actually Steven Protter link was the exact answer I was looking for. Basically our networking group had shut off ICMP traffic and we lost on network for our hpux machines.Because of that the took off the filter and where sniffing the network for ICMP traffic to track down machines infected with the virus. While doing this they also saw our unix machines generating ICMP traffic.