one day, E company want to expand capacity of ethernet service from 4VC4 to 8VC4, and there is a EPL service using EGS2 board in transmission equipment.
and just use one VCTRUNK to bind 4VC4. and port tag attribute is set to be access.
huawei engineer use another VCTRUNK to bind another 4VC4 and use different VLAN id. configurate EVPL service in transmission equipment. ping from router
to router is ok. but can't transmit 8VC4, there is a lot of package lost
There is two method to resolve this problem.
1, partition VLAN id in router, 4VC4 use one VLAN id, another 4VC4 use another VLAN id, set transmission equipment port attribute tag aware, and configure EVPL
service use two VCTRUNK with two VLAN id. this is the kind of service two VCTRUNK share one port service.
2,change the board from EGS2 to EGT2, EMS4,EGS4 which can bind 8 VC4 just use one VCTRUNK.
Because after change the capacity from 4VC4 to 8VC4 in router, transmission equipment set EVPL service with the port set to be access attribute, the whole 8VC4
can't pass through the transmission equipment . EGS2 board can't divide the 8VC4 into the two VCTRUNCK, so this configuration is not right.
EVPL service has two way to distinguish service, one is VLAN ID another one is VLAN ID with MPLS. so chose right service type and right ehernet board when there
is different need.