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atagliasacchi
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LDP session error (KeepAlive expired)

Thu Jul 29, 2021 1:07 pm

Hi guys,
We have a problem on some LDP targeted sessions which hang up every 180 seconds.
The problem occures on a R1 CCR1016 (6.24) and only toward some peers, for example R13 CCR 1009 6.42.12 and R15 RB3011 4.45.9 (R1 is connected to many routers, most of them Mikrotik and no problems, some of them from other vendors, toward none of them there are problems)

sniffing traffic (on R13) we can see:
[*] new tcp connection established ( R13 port 40901 →R1 port 646)
[*] Initialization message, (from R13 Session KeepAlive Time: 180)
[*] some ldp exchange (Label Mapping Messages)
[*] regular LDP UDP Hello Messages from R1 to R13
[*] NO LDP UDP Hello Messages from R1 to R13
[*] regular KeepAlive message from R1 to R13 (every around 60 sec)
[*] NO regular KeepAlive message from R13 to R1
[*] after 180 sec, R1 sends Notification Message and then RESET (Fatal Error, KeepAlive Timer Expired)
[*] new tcp connection starts

The corresponding vpls drops and then returns functioning.
R1 CCR1016 (6.24) is pppoe concentrar, it has many vlps, 98% not affected by this issue (we would not like to update it)

As we have some dozen of routers and it looks like only some combination of RouterOS have this behaviuor, do You have any suggestion on similar issue and or compatibility matrix for LDP between different versions of RouterOS?


Waiting for hearing from You.
Regards

Alberto
 
mada3k
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Re: LDP session error (KeepAlive expired)

Fri Jul 30, 2021 12:36 pm

6.24!? Thats a 7 year old software

The issue might even be resolved in newer version
 
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StubArea51
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Re: LDP session error (KeepAlive expired)

Fri Jul 30, 2021 3:53 pm

I would agree....you need to be running the same long term version of RouterOS on each router and restest.
 
atagliasacchi
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Re: LDP session error (KeepAlive expired)

Tue Aug 03, 2021 10:40 am

Hi, Thanks!
I agree with You on updates and best practice to run same long term version of RouterOS on each router.
In the meanwhile we temporaly solved updating only the R13 from 6.42.12 to 6.47.10 ; the central pppop R1 still running 6.24 (as previuosly stated, it's a production environment with some hundreds of vpsl, all of them were working except the 2 mentioned in the post. We will plan updates of routers in the next days.

Alberto

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