ESR series service routers.ESR-Series. User manual
12.13.2 L3VPN
Configure CE1 and CE2:
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When configuring MTU on a tunnel, consider the following:
At least one mpls label will be present when passing through the tunnel. Accounting should
include all labels in the stack, for example,explicit null or entropy label;
If MTU of the outgoing interface is exceeded, the packet will be dropped (if GRE trafficmatch
fragment is disabled);
Control world is not supported;
DF bit will be set to 1.
Approximatepacket structure is given in figure below:
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