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Author Topic: VLACP frame format when used with fabric connect SPB  (Read 3120 times)

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Offline wilier

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VLACP frame format when used with fabric connect SPB
« on: January 07, 2015, 12:24:02 AM »
Hi,

Does anyone have a wireshark/cloudwire/ethereal/pcap/tcpdump of a VLACP frame when used with SPB fabric connect?
Does the VLACP frame use the backbone VLAN and I-SID?

Does it look like (a) or (b) or (c)?

(a) includes VLAN info
e.g B-VLAN = 100.
01-80-c2-00-11-00
00-00-00-00-00-01
81-00-00-64  <- VLAN tag
81-03 ... <- VLACP ethertype

(b) Includes VLAn and I-SID
e.g B-VLAN = 100. I-SID = 12992001
01-80-c2-00-11-00
00-00-00-00-00-01
81-00-00-64          <- B-VLAN
88-e7-00-c6-3e-01 <-I-TAG and I-SID
81-03 ...  <- VLACP ethertype

(c) does not include VLAN or I-SID info
01-80-c2-00-11-00
00-00-00-00-00-01
81-03 ...  <- VLACP ethertype



Thanks in advance.

p.s. It's really hard to find captures of bay networks/nortel/avaya products!






Offline Dominik

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Re: VLACP frame format when used with fabric connect SPB
« Reply #1 on: January 08, 2015, 04:03:04 PM »
This is quit a good question.  I suggest that the answer is A,  maybe I can verify that in my lab next week.  Do you prepare yourself for an Avaya certification?
Its always the networks fault!
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Offline wilier

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Re: VLACP frame format when used with fabric connect SPB
« Reply #2 on: January 11, 2015, 05:40:01 PM »
I'm not preparing for a certification.  I work for a vendor who has some equipment that needs to inter-operate with Avaya's Fabric connect.
Thanks for looking into it.

Offline Dominik

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Re: VLACP frame format when used with fabric connect SPB
« Reply #3 on: January 13, 2015, 10:16:23 AM »
On a VSP4000 it looks like the answer C.
I captured on 2x VSP4000 with SPB and VLACP enabled on the direct connected uplink.

Cheers
Its always the networks fault!
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Offline wilier

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Re: VLACP frame format when used with fabric connect SPB
« Reply #4 on: January 13, 2015, 10:32:55 PM »
Thanks Dominik.  Did you test with multiple Bridges as per the example below?

The question is then how does VLACP perform end to end (BEB to BEB) fault detection if there is no B-VID or I-SID?  Is the frame forwarded at each intermediate bridge or does the link local bridge relay the information?
e.g.
BEB----BCB----BCB----BEB    physical connectivity
VLACP----------------VLACP fault detection




Offline yvind Nikolaisen

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Re: VLACP frame format when used with fabric connect SPB
« Reply #5 on: January 14, 2015, 12:37:28 AM »
In your example you won't get VLACP across the intermediate BCBs. VLACP from BEB to BCB, BCB to BCB, BCB to BEB is what you should set up. There's no point trying to check the connectivity from BEB to BEB, that's what you have those BCBs for. Hopefully you have some more links in your BCB core to have some redundancy.

Best regards,
yvind
Best regards,

yvind Nikolaisen
Senior Network Architect
NetNordic Communications AS
Avaya ACE Fx #204

Offline Dominik

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Re: VLACP frame format when used with fabric connect SPB
« Reply #6 on: January 14, 2015, 11:53:23 AM »
As mentioned by yvind VLACP works only point to piont, so you can only use VLACP to ensure that two direct connected cables are attached togheter.

The Destination is DST: Nereast (configured VLACP MAC).

You can trick that with an T-UNI Port mode over an SPB Fabric, but not sure if you really want to do that.
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Offline wilier

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Re: VLACP frame format when used with fabric connect SPB
« Reply #7 on: January 14, 2015, 09:49:28 PM »
I have a good reason why you would want VLACP to extend from BEB to BEB. For fault detection of the I-SID stream.  I know I could use CFM to do this diagnostically but what would be the best way to do this dynamically ?(i.e. let the protocol notify me when data is not passing from BEB to BEB correctly for a particular I-SID). Like something equivalent to an I-SID keep alive message, that actually flows from BEB to BEB along the same path as the user data?
« Last Edit: January 14, 2015, 09:59:49 PM by wilier »

Offline Dominik

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Re: VLACP frame format when used with fabric connect SPB
« Reply #8 on: January 15, 2015, 01:36:32 AM »
OK, if you want to do that VLACP is not your protocol. Maybe the engeneering could tweak VLACP to listen to multiple MAC adresses, but that is at the moment not the case and had to be implemented from the Avaya engeneering.
A connected Client can do any HA mechanism or protocoll over the SPB fabric end to end.
If you want to do that on switches directly maybe you could SLAMon to make end to end probing.
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