I have a similar problem and, I think, the problem is olso MTU but I don't know where...
Look at attached network layout:
rb1-core, rb2-core, rb-core-tower-a and rb-core-tower-b run MPLS with MPLS-MTU interface configured to 1526 in according of my previous (post
On tower sides the eth1 of each rb1200 are the only interface configured in mpls interfaces and are linked with ethernet cable to each rb411 (where the wlan1 and eth1 are bridged).
Olso on core side the eth1 of each router os x86 (i have virtual machine with router os for x86) are the only interfaces configured in mpls interface and are linked with ethernet cable to each rb411 (where the wlan1 and eth1 are bridged).
The mpls run over an ospf routing between routers (rb1-core, rb2-core, rb-core-tower-a and rb-core-tower-b) that annunce the 192.168.17.0/24 network, on all router there are olso a loopback interfaces used for transport address (ldp interface) with 172.16.0.x/32.
There are olso configured vpls between rb-core-tower-a and rb1-core/rb2-core and rb-core-tower-b and rb1-core/rb2-core
From tower side this vpls are bridged with other eth interfaces of rb1200 where are linked other rb411 for customer collection (customer use pppoe-client with sxt to open connection).
From core side the vpls are bridged to a standalone bridge where is in listen a centralized pppoe-server (i prefer to have pppoeserver on a virtual interface like bridge who not have problem of link up/down).
Evrithing work fine but some user tell me that few site (some governament web site or free webmail service) don't load.
The workaround to work, but don't use vpls/mpls, is to insert eth1 of tower side in to the bridge that contain vpls.
The only thing that I'm not able to change is the L2MTU value of eth1 of core side (the virtual machine with router OS).
What is wrong? I have some difficult to comprend MTU End to End!!
What command can i use to troubleshoot mtu problem?
Thanks in advance.
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