MAD-BFD

[aali]

Thanks

[Michael A. McKenney]

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

[aali]

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

[paulgear]

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. :-)

[manuel.bitzi]

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

[aali]

Please advise!

[pombeii]

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.