In somtime, we do see a latency on the network. Especially, receving bigger frame size or heavy traffic from Internet. It would be many issue, but one of issue is related to MTU size mismatching. Let check MTU size on MPLS Network.
The MPLS Frame mode tag adds 4 bytes to every frame. You might need to increase a MTU size on your interface to accommodate this, to prevent packets from being fragmented. The MTU is automatically increased on WAN interfaces, but must be manually configured on LAN interfaces.
Ethernet uses a default MTU of 1500 bytes. If you are using an MPLS implementation that uses just one label, increase it to 1504bytes. MPLS VPNs and MPLS traffic engineering use two labels, 8 bytes, so you must increase the MTU size to 1508 bytes if you are using either of these, 4 + 8 bytes. Increase the MTU to 1512 bytes when using MPLS VPNs.
To manually set MTU size, use the MPLS MTU bytes commadn is interface configuration mode. You may also need to enable jumbo frame support on the connecting switch for better throughput.
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