I have a MTR running , now my MPLS for the network starts at hop 5, strangely the latency gone up quite higher
MPLS enabled: latency on hop 5 is 23.5ms
HOST: Loss% Snt Last Avg Best Wrst StDev
10.249.5.198 0.0% 2 0.5 0.3 0.2 0.5 0.2
10.249.2.180 0.0% 2 0.9 1.1 0.9 1.2 0.2
10.249.4.25 0.0% 2 1.8 1.8 1.8 1.8 0.0
10.249.5.236 0.0% 2 23.5 23.8 23.5 24.2 0.5
10.249.4.196 0.0% 2 27.0 28.8 27.0 30.5 2.4
10.249.2.57 0.0% 2 24.0 25.5 24.0 26.9 2.0
10.249.5.108 0.0% 2 25.5 24.2 22.9 25.5 1.9
10.249.5.116 0.0% 2 33.6 28.1 22.5 33.6 7.8
10.249.4.108 0.0% 2 28.2 25.1 21.9 28.2 4.4
10.249.4.116 0.0% 2 22.4 24.1 22.4 25.9 2.5
10.249.0.78 0.0% 2 21.3 19.6 17.9 21.3 2.4
example: MPLS LDP disabled on hop 5 and 6, latency down to 6.1ms
10.249.5.198 0.0% 2 0.2 0.2 0.2 0.2 0.0
10.249.2.180 0.0% 2 0.9 0.9 0.9 1.0 0.1
10.249.4.25 0.0% 2 2.1 2.8 2.1 3.5 1.0
10.249.5.236 0.0% 2 6.1 4.6 3.1 6.1 2.2
10.249.4.196 0.0% 2 10.0 9.5 9.0 10.0 0.7
10.249.2.57 0.0% 2 12.3 10.4 8.5 12.3 2.7
10.249.5.108 0.0% 2 40.3 45.3 40.3 50.2 7.0
10.249.5.116 0.0% 2 27.9 26.5 25.2 27.9 1.9
10.249.4.108 0.0% 2 33.0 30.5 28.0 33.0 3.5
10.249.4.116 0.0% 2 33.5 31.3 29.1 33.5 3.1
10.249.0.78 0.0% 2 25.1 20.8 16.5 25.1 6.1
Notice the difference in latency, almost tripple less when disabled, what can cause this? MTU? i have no issues, just curious why it goes up , thought mpls improves switching?
the backbone kit is combination of trango, ubnt, radwin gear all with highest values mtu set in the radios, most RouterOS is combination of RB1200 / 493g / RB1100
I lowered as suggested , here is the tracepath results, pmtu now 1496, this is mind boggling for me, I suspect this is causing issues on the voip under load , any other suggestions, the mpls forwarding table is about 1900 entries
hop 4 is a rb1100 with latest version and default mtu’s
wireless is ubnt gear with mtu set to 2024
hop 5 is a rb493g with latest version and default mtu’s
wireless is radwin 2000b which supports jumbro frames
I had to put to rest an rb450g when I started using mpls / vpls because of mtu problems. Sounds like you could have mtu issues with your 493. I can’t remember the specifics but seems all the 4xx series rb’s could pass large enough frames to run mpls.
Okay i will have to dig a bit deeper after hours again…
If i go to each hop and ping the peers, the latency is 1ms, but only on the forwarding its causing the latency. i suspect the 4xx version is doing this, also for mikrotik enigineers, the ports is both on port 8 on the 1100 and the 493g, I know there was a bug fix in the 1200 series port 8 which solved my previous mtu issue, could be related to the 1100 or 493?
On MPLS enabled network packets are switched along the label switching path not directly back to the sender so it will increase the latency in pings and traceroutes.
You can reliably use ICMP echo’s but not any traceroute feature reliably.
I suspect the UBNT gear is causing your problems but it’s very hard to say.
We have not been able to reliably use UBNT gear for MPLS transports.
