Controller Based WLANs

Monitoring port channel in Aruba Controllers

by ‎07-30-2015 06:07 AM - edited ‎07-30-2015 06:07 AM
Q:

Does enabling port channel in Aruba OS 6.4 cause network down?



A:

Starting from Aruba OS 6.4, Port monitoring can be enabled on the port-channel.

The ports are getting set to blocked state on enabling/disabling port monitoring on the port-channel.

(Aruba)#show interface port-channel 7


Port-Channel 7 is administratively up
Hardware is Port-Channel, address is 00:1A:1E:00:0D:78 (bia 00:1A:1E:00:0D:78)
Description: Link Aggregate (LACP)
Spanning Tree is disabled
Switchport priority: 0
Member port: 
    GE 0/0/2, Admin is up, line protocol is up
    GE 0/0/3, Admin is up, line protocol is up
Last clearing of "show interface" counters 0 day 0 hr 13 min 17 sec 
link status last changed 0 day 0 hr 10 min 57 sec
    1916 packets input, 164110 bytes
    Received 1790 broadcasts, 0 runts, 0 giants, 0 throttles
    0 input error bytes, 0 CRC, 0 frame
    1785 multicast, 126 unicast
    368 packets output, 68805 bytes
    0 output errors bytes, 0 deferred
    0 collisions, 0 late collisions, 0 throttles
Port-Channel 7 is TRUSTED

(Aruba) #show datapath port 

Datapath Port Table Entries
---------------------------

Flags: Q - trunk,  T - trusted, B - blocked,  L - LAG
       M - tunneled node, X - xSec, J - Jumbo enabled

Port      PVID  Ingress ACL  Egress ACL  Session ACL   MTU       Flags
--------  ----  -----------  ----------  -----------   ------    ------
0/0/0     1     0            0           0            1500      QT
0/0/1     1     0            0           0            1500      QT
0/0/2     1     0            0           0            1500      QTL
0/0/3     1     0            0           0            1500      QTL
0/0/4     1     0            0           0            1500      QTB
0/0/5     4093  0            0           0            1500      T


(Aruba) #show port monitor


After enabling port monitoring on 0/0/0, the ports goes to blocked state. 

(Aruba) (config) #interface gigabitethernet 0/0/0
(Aruba) (config-if)#port monitor port-channel 7


(Aruba)#show port monitor 


Monitor Port  Port being Monitored
------------  --------------------
GE 0/0/0      port-channel 7

 

(Aruba) #show datapath port 

 

Datapath Port Table Entries
---------------------------

Flags: Q - trunk,  T - trusted, B - blocked,  L - LAG
       M - tunneled node, X - xSec, J - Jumbo enabled

Port      PVID  Ingress ACL  Egress ACL  Session ACL   MTU       Flags
--------  ----  -----------  ----------  -----------   ------    ------
0/0/0     1     0            0           0            1500      QT
0/0/1     1     0            0           0            1500      QT
0/0/2     1     0            0           0            1500      QTBL
0/0/3     1     0            0           0            1500      QTBL
0/0/4     1     0            0           0            1500      QTB
0/0/5     4093  0            0           0            1500      T

(Aruba)#show interface port-channel 7


Port-Channel 7 is administratively up
Hardware is Port-Channel, address is 00:1A:1E:00:0D:78 (bia 00:1A:1E:00:0D:78)
Description: Link Aggregate (LACP)
Spanning Tree is disabled
Switchport priority: 0
Member port: 
    GE 0/0/2, Admin is up, line protocol is up
    GE 0/0/3, Admin is up, line protocol is up
Last clearing of "show interface" counters 0 day 0 hr 15 min 17 sec 
link status last changed 0 day 0 hr 12 min 57 sec
    2243 packets input, 190084 bytes
    Received 2111 broadcasts, 0 runts, 0 giants, 0 throttles
    0 input error bytes, 0 CRC, 0 frame
    2106 multicast, 132 unicast
    407 packets output, 78064 bytes
    0 output errors bytes, 0 deferred
    0 collisions, 0 late collisions, 0 throttles
Port-Channel 7 is TRUSTED

 

From show datapath port output, we could see the port 0/0/2 and 0/0/3 are in blocked state which results in network down.

The workaround for this issue would be to shutdown and no shutdown port-channel port which will recover the situation. 

This is the software defect which is addressed in Aruba OS 6.4.2.5 and above.

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