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M4300-12X12F - LAG State Admin Mode D-Disable
Hi, I have 2 M4300-12X12F in stack. After this error "Diagnostically disabling interface lag 8 as rate limit of 15 for 3 consecutive seconds has been exceeded" I found both ports included in the LA...
Hi xw32
Welcome to Community!
How about your network topology? Is there loop connect? D-disable status may be casued by spanning-tree detect there is a loop.
Regards,
Eric
Hi, both ports number 3 of the netgear switch went into block were attached in lag towards an HP aruba switch, I am attaching a diagram of how the various switches are connected; the loop was probably generated by a switch3 reset procedure (HP).
thanks for the support
Yes, I see both port 1/0/3 and 2/0/3 connect to switch2, and it will cause loop, Loop Protection will D-disable some port when detect loop. Is it necessary to connect two ports(1/0/3, 2/0/3) to switch2? Is it possible binding two ports as a lag?
And what about other port connection? such as lag1..lag8?
Could you please command as 'show spanning-tree summary' and 'show spanning-tree mst port summary 0 active', and print the output info here? I want to check which ports is discarding status.
Hi, ports 3 were part of LAG1 it is correct that they are connected to switch2 to create redundancy in case of failure of one of the 2 netgear switches in stack. Right now they are disconnected I tried to remove them from the LAG to try to reactivate Admin Mode from D-Disable to Enable.
(M4300-12X12F) >show spanning-tree summary
Spanning Tree Admin Mode.......... Enabled
Spanning Tree Version............. IEEE 802.1w
BPDU Guard Mode................... Disabled
BPDU Filter Mode.................. Disabled
Configuration Name................ ****
Configuration Revision Level...... ****
Configuration Digest Key.......... ****
Configuration Format Selector..... 0
No MST instances to display.(M4300-12X12F) >show spanning-tree mst port summary 0 active
STP STP Port
Interface Mode Type State Role Desc
--------- -------- ------- ----------------- ---------- ----------
1/0/15 Enabled Forwarding Designated
1/0/19 Enabled Forwarding Designated
1/0/23 Enabled Forwarding Designated
1/0/24 Enabled Forwarding Designated
2/0/4 Enabled Forwarding Designated
2/0/15 Enabled Forwarding Designated
2/0/19 Enabled Forwarding Designated
2/0/20 Enabled Forwarding Designated
2/0/23 Enabled Forwarding Designated
2/0/24 Enabled Forwarding Designated
lag 2 Enabled Forwarding Designated
lag 3 Enabled Forwarding Designated
lag 4 Enabled Forwarding Designated
lag 5 Enabled Forwarding Designated
lag 6 Enabled Forwarding Designated
lag 7 Enabled Forwarding DesignatedOk, got it.
I notice you diable STP mode on LAG1, right? It's mean LAG1 not participate spanning-tree caculate, and will casue broadcast stome. The root cause is 'BPDU Storm: An interface/port will go into D-Disable state if number of bpdus exceeds 15 for 3 consecutive seconds.'.
So please enable stp port mode on lag1, and then STP will change port to Discarding status if there is loop in your network.
interface lag 1
description 'trunktolan'
port-channel static
no spanning-tree port mode
vlan participation include 8,25
vlan tagging 8,25
exit
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