Comware

Thanks

What are the four switches you are configuring?  How many in IRF? 

Sorry for the confusion.  I meant (4) A5800-24 port switches will be in a single IRF domain and would like to know how to configure MAD-BFD.  The HP user guide only proivdes configuration details for (2) Switches in an IRF stack.  see below:  With (4) switches, I am confused about physical connection.

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vlan 100 #

interface vlan-interface100

mad bfd enable

mad ip address 100.100.100.1 255.255.255.0 member 1

mad ip address 100.100.100.2 255.255.255.0 member 2

 interface GigabitEthernet1/0/25

port link-mode bridge

port access vlan 100

stp disable

 interface GigabitEthernet2/0/3

port link-mode bridge

port access vlan 100

stp disable

My understanding is that every switch in the IRF stack needs to have an IP address registered on the MAD BFD VLAN.  Here's an example from my two-switch 5500 stack:

interface Vlan-interface555
 description MAD BFD for IRF monitoring
 ip address 10.5.55.254 255.255.255.0
 mad ip address 10.5.55.1 255.255.255.0 member 1
 mad ip address 10.5.55.2 255.255.255.0 member 2

I believe you would extend this by simply adding:

 mad ip address 10.5.55.3 255.255.255.0 member 3
 mad ip address 10.5.55.4 255.255.255.0 member 4

And then assign two ports in VLAN 555 to each switch, chaining from one to another in a ring, just like your IRF links.

Disclaimer: i have not done this - my IRF stacks have only ever had 2 switches each. :-)

Hi guys

In MAD BFD each member gets an IP. If the member is master, it sends an hello over the MAD-BFD-Interface. If an master receives a hello paket from an other master, split brain is detected.

The more you connect the switches over the bfd-link (ie vlan 100) the higher is the chance to detect a split brain.

br

Manuel

Please advise!

I always recommend this doc for MAD configuration:

http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c03014400/c03014400.pdf

The examples were created on 5800&5820 series.