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port 7 is Blocked by LACP

Occasional Visitor

port 7 is Blocked by LACP

Dear All!

Our customer experiences a problem with ProCurve Switch 2650. PCs connected to siwtch are losing connection.
Siwtch is logging e.g.


I 01/15/90 20:02:47 ports: port 7 is now off-line
I 01/15/90 20:02:49 ports: port 7 is Blocked by LACP
I 01/15/90 20:02:52 ports: port 7 is now on-line
I 01/15/90 20:04:28 ports: port 7 is now off-line
I 01/15/90 20:04:30 ports: port 7 is Blocked by LACP
I 01/15/90 20:04:33 ports: port 7 is now on-line


however :


HP ProCurve Switch 2650# show lacp
LACP
PORT LACP TRUNK PORT LACP LACP
NUMB ENABLED GROUP STATUS PARTNER STATUS
---- ------- ------- ------- ------- -------
1 Passive 1 Up No Success
2 Passive 2 Up No Success
3 Passive 3 Up No Success
4 Passive 4 Up No Success
5 Passive 5 Up No Success
6 Passive 6 Up No Success
7 Passive 7 Up No Success




Configuration:


HP ProCurve Switch 2650# write term
; J4899A Configuration Editor; Created on release #H.07.02
hostname "HP ProCurve Switch 2650"
cdp run
ip default-gateway 192.168.1.1
ip routing
no timesync
snmp-server community "public" Unrestricted
snmp-server host 192.168.1.137 "public" Not-INFO
vlan 1
name "DEFAULT_VLAN"
untagged 1-50
ip address 192.168.1.252 255.255.255.0
exit
fault-finder bad-driver sensitivity high
fault-finder bad-transceiver sensitivity high
fault-finder bad-cable sensitivity high
fault-finder too-long-cable sensitivity high
fault-finder over-bandwidth sensitivity high
fault-finder broadcast-storm sensitivity high
fault-finder loss-of-link sensitivity high
-----------------------------------------------------------------------------------------------------------------



Product:
HP J4899A ProCurve Switch 2650
Version:
H.07.02, ROM H.07.01



1) It seems to be, that ports are in "PASSIVE" LACP mode, than why LACP is blocking ports? Is there a configuration error ?
2) Because of low sw version I suggested upgrade to H.07.31
3) BUT, I could not find this problem in solved Problem Reports on external web site.
4) Where I can find complete problem reports for this product and in which release was solved ?


Thanks

Gabriel

1 REPLIES
Valued Contributor Valued Contributor

Re: port 7 is Blocked by LACP

Hi

The questions first:

1. If you look at the log you will notice that what happens is in sequence:
- port goes offline
- LACP blocks port
- port comes online
Basic LACP functionality is that whenever a link comes online, passive LACP will kick in and block the port until it knows if it has an active partner. If it does, it will create a trunk, if not, it will release the port. This most likely is a configuration issue, but not in LACP.

2. Shortly, yes. Always use the latest FW, there's usually good reasons for new FW release.

3 & 4. There's neither software fix nor a problem report as this is not a problem or error, but as I said basic LACP functionality.

Most likely the problem is Duplex Mismatch on the link, see http://e2epi.internet2.edu/CaseStudies/SC02/DuplexMismatch.html.

To get rid of this, first make sure that both ends of the link are configured to the same speed-duplex setting, i.e. Auto to Auto or FDx to FDx, but NOT Auto to FDx. It might be also good idea to update the NIC driver, if this is a PC.

Next, disable LACP completely if you do not use it in trunking (= link aggregation). You do not really lose anything, as there are still 2 aggregation methods left, HP port trunking and FEC, if you want to use it. This is done in switch command line with commands

con t
int all
no lacp
write mem

This does not require a switch reset.

This should solve the problem.

HTH,
Arimo