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2910al + Cisco3750E-TD16 = LACP+MSTP

 
Alexi Lookin
Occasional Advisor

2910al + Cisco3750E-TD16 = LACP+MSTP

Hi!

 

2910al has static LACP trunk to Cisco3750E

 

trunk 13-20 Trk60 LACP

spanning-tree Trk60 admin-edge-port
spanning-tree Trk60 priority 4 bpdu-filter bpdu-protection pvst-protection

 

Cisco 3750E has this config

 

spanning-tree mode pvst
spanning-tree portfast default
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
spanning-tree vlan 1 priority 24576
!
vlan internal allocation policy ascending
!
!
!
!
interface Port-channel1
no switchport
ip address 192.168.111.16 255.255.255.0
!
interface GigabitEthernet1/0/1
no switchport
no ip address
channel-group 1 mode active

....

interface GigabitEthernet1/0/8
no switchport
no ip address
channel-group 1 mode active
!

 

Everything looks fine:

 

at cisco side

 

sw12-3750G-TD16-1#sh etherchannel 1 summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator

M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port


Number of channel-groups in use: 1
Number of aggregators: 1

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(RU) LACP Gi1/0/1(P) Gi1/0/2(P) Gi1/0/3(P)
Gi1/0/4(P) Gi1/0/5(P) Gi1/0/6(P)
Gi1/0/7(P) Gi1/0/8(P)

 

at procurve side:

 

sw16-2910-blade-edge2# sh lacp

LACP

PORT LACP TRUNK PORT LACP LACP
NUMB ENABLED GROUP STATUS PARTNER STATUS
---- ------- ------- ------- ------- -------
13 Active Trk60 Up Yes Success
14 Active Trk60 Up Yes Success
15 Active Trk60 Up Yes Success
16 Active Trk60 Up Yes Success
17 Active Trk60 Up Yes Success
18 Active Trk60 Up Yes Success
19 Active Trk60 Up Yes Success
20 Active Trk60 Up Yes Success
A1 Active Trk45 Up Yes Success

 

But periodically 2910al put this trunk down and up:

 

I 11/08/11 06:11:22 00077 ports: port 16 in Trk60 is now off-line
I 11/08/11 06:11:22 00077 ports: port 18 in Trk60 is now off-line
I 11/08/11 06:11:22 00077 ports: port 19 in Trk60 is now off-line
I 11/08/11 06:11:22 00077 ports: port 20 in Trk60 is now off-line
I 11/08/11 06:11:23 00077 ports: port 13 in Trk60 is now off-line
I 11/08/11 06:11:23 00077 ports: port 14 in Trk60 is now off-line
I 11/08/11 06:11:23 00077 ports: port 15 in Trk60 is now off-line
I 11/08/11 06:11:23 00079 ports: trunk Trk60 is now inactive
I 11/08/11 06:11:23 00077 ports: port 17 in Trk60 is now off-line
I 11/08/11 06:13:45 00435 ports: port 13 is Blocked by LACP
I 11/08/11 06:13:45 00435 ports: port 15 is Blocked by LACP
I 11/08/11 06:13:45 00435 ports: port 16 is Blocked by LACP
I 11/08/11 06:13:45 00078 ports: trunk Trk60 is now active
I 11/08/11 06:13:45 00435 ports: port 13 is Blocked by STP
I 11/08/11 06:13:45 00076 ports: port 13 in Trk60 is now on-line
I 11/08/11 06:13:45 00435 ports: port 15 is Blocked by STP
I 11/08/11 06:13:45 00076 ports: port 15 in Trk60 is now on-line
I 11/08/11 06:13:45 00435 ports: port 16 is Blocked by STP
I 11/08/11 06:13:45 00076 ports: port 16 in Trk60 is now on-line
I 11/08/11 06:13:45 00435 ports: port 14 is Blocked by LACP
I 11/08/11 06:13:45 00435 ports: port 17 is Blocked by LACP
I 11/08/11 06:13:45 00435 ports: port 18 is Blocked by LACP
I 11/08/11 06:13:45 00435 ports: port 14 is Blocked by STP
I 11/08/11 06:13:45 00076 ports: port 14 in Trk60 is now on-line
I 11/08/11 06:13:45 00435 ports: port 17 is Blocked by STP
I 11/08/11 06:13:45 00076 ports: port 17 in Trk60 is now on-line
I 11/08/11 06:13:45 00435 ports: port 18 is Blocked by STP
I 11/08/11 06:13:45 00076 ports: port 18 in Trk60 is now on-line
I 11/08/11 06:13:46 00435 ports: port 19 is Blocked by LACP
I 11/08/11 06:13:46 00435 ports: port 20 is Blocked by LACP
I 11/08/11 06:13:46 00435 ports: port 19 is Blocked by STP
I 11/08/11 06:13:46 00076 ports: port 19 in Trk60 is now on-line
I 11/08/11 06:13:46 00435 ports: port 20 is Blocked by STP
I 11/08/11 06:13:46 00076 ports: port 20 in Trk60 is now on-line

 

which features I forgot to configure to prevent blocking trunk by LACP/MSTP?

 

1 REPLY 1
ISoliman
Super Advisor

Re: 2910al + Cisco3750E-TD16 = LACP+MSTP

Filter the BPDUs from Cisco Side aswell, but make sure that no loop will be caused, also for BPDU filter and BPDU protection you c annot use them together coz BPDU filter has priority over BPDU protection so the protection mode will never work.

Another thing to confirm, to which VLANs is the Trk60 assigned ? from Cisco Side you configured the link aggregation as Layer 3 link so from HP it should be assigned to 1 VLAN only (isolated VLAN layer 3 to simulate L3 port).