R3303-HP HSR6800 Routers MPLS Command Reference

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Usage guidelines
In Ethernet mode, P-Tag is not transferred on the PW. For a packet from a CE, if it contains the service
delimiter, the PE removes the service delimiter and adds a PW label and a tunnel label into the packet
before forwarding the packet. Otherwise, the PE adds a PW label and a tunnel label into the packet and
then forwards the packet. For a packet to be sent downstream, whether the PE adds the service delimiter
into the packet depends on your configuration. However, rewriting and removing of existing tags are not
allowed.
In VLAN mode, packets transmitted over the PW must carry a P-Tag. For a packet from a CE, if it contains
the service delimiter, the PE keeps the P-Tag unchanged or changes the P-tag to the VLAN tag expected
by the peer PE or to a null tag (the tag value is 0), and then adds a PW label and a tunnel label into the
packet before sending the packet out. If the packet contains no service delimiter, the PE adds the VLAN
tag expected by the peer PE or a null tag, and then a PW label and a tunnel label into the packet before
sending the packet out. For a packet to be sent downstream, the PE rewrites, removes, or retains the
service delimiter depending on your configuration.
Examples
# Configure the PW transport mode as Ethernet.
<Sysname> system-view
[Sysname] pw-class pw100
[Sysname-pw-pw100] trans-mode ethernet
unknown-unicast-restrain
Use unknown-unicast-restrain to specify the unknown unicast suppression ratio for a VPLS instance.
Use undo unknown-unicast-restrain to restore the default.
Syntax
unknown-unicast-restrain ratio
undo unknown-unicast-restrain
Default
The unknown unicast suppression ratio for a VPLS instance is 100%.
Views
VSI view
Default command level
2: System Level
Parameters
ratio: Specifies the unknown unicast suppression ratio for the VPLS instance, in the range of 1 to 100, in
percentage.
Usage guidelines
Together with the bandwidth command, this command can suppress the unknown unicast traffic in a
VPLS instance. When the speed of the unknown unicast traffic exceeds the product of the speed limit and
this ratio, the extra unknown unicast traffic is dropped.
Examples
# Set the unknown unicast suppression ratio for VPLS instance aaa to 50%.