Ethernet Switching
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Ethernet Switching

Loop detection and handling on EX4200 / EX3200 on trunk ports

[ Edited ]
‎09-13-2019 03:08 AM

Hello, we are replacing an Cisco swith with EX4200 / EX3200. The switch has no access ports, all ports are trunks.

 

In case of loop in a VLAN, our Cisco isses a MAC FLAPPING warning (SW_MATM-4-MACFLAP_NOTIF). Similar functionality we use on Edge-Core switches, this is called Sticky MAC and prevents re-learning MAC on the wrong port. In both cases, we know that a loop occured and know affected MACs, VLANs and ports.

 

Is it possible to achieve a similar functinality on *trunk* (!) ports for EX4200 / EX3200 - i.e. some MAC move/flapping, sticky MAC  or any other kind of (indirect) loop notification ?

 

There is a requirement for spanning tree to be disabled.

 

For access ports, secure-access-port setting works fine, but for trunks I did not find anything usable.

Thank you for any ideas.

4 REPLIES 4
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Ethernet Switching

Re: Loop detection and handling on EX4200 / EX3200 on trunk ports

‎09-13-2019 03:38 AM

Hi Janrovner,

 

Feature is called "persistent-learning" on Juniper, essentially identical.  Please check this:

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/understanding_and_using_persisten...

https://forums.juniper.net/t5/Ethernet-Switching/Juniper-Persistant-Mac-vs-Cisco-Sticky-Mac/td-p/159...

 

Hope this helps.

Regards,
-r.

--------------------------------------------------

If this solves your problem, please mark this post as "Accepted Solution."
Kudos are always appreciated :).

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Solution
Accepted by topic author janrovner
‎11-27-2019 05:39 AM

Re: Loop detection and handling on EX4200 / EX3200 on trunk ports

‎09-16-2019 04:30 AM

Hello, thank you but unfortunately, it does not work on trunk ports (as I said).

Is there any other solution? Thank you

 

 

admin@switch# show interfaces ge-0/0/47.0
family ethernet-switching {
port-mode trunk;
vlan {
members 1010;
}
native-vlan-id 247;
}



admin@switch# show | compare
[edit ethernet-switching-options]
+ secure-access-port {
+ interface ge-0/0/47.0 {
+ persistent-learning;
+ }
+ }

{master:0}[edit]
admin@switch# commit check
[edit ethernet-switching-options secure-access-port]
'interface ge-0/0/47.0'
Persistent Learning configuration is not allowed for trunk port
error: configuration check-out failed

 

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Ethernet Switching

Re: Loop detection and handling on EX4200 / EX3200 on trunk ports

‎09-21-2019 03:50 AM

Hi janrover,

 

If the issue is resolved, request you to please mark the post accordingly.

 

Hope this helps.

Regards,
-r.

--------------------------------------------------

If this solves your problem, please mark this post as "Accepted Solution."
Kudos are always appreciated :).

 

 

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Ethernet Switching

Re: Loop detection and handling on EX4200 / EX3200 on trunk ports

‎09-21-2019 01:00 PM

@mriyaz wrote:

Hi janrover,

 

If the issue is resolved, request you to please mark the post accordingly.

 

Hope this helps.

Regards,
-r.

 


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