Setting the vpls vc mode, Vpls raw mode – Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) User Manual
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Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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Configuring VPLS instances
3
By default, each PE router attempts to initiate an LDP session through extended discovery with its
VPLS peers, when a session is not already established. Each VPLS instance is allocated a range of
32 labels. The PE router assigns one label in the range to each of its peers to be used as the peer’s
local VC label. When there are more than 32 peers in the VPLS instance, an additional label range
is automatically allocated to the VPLS instance. The size of the label range depends on the
configured maximum number of VPLS instances on the device. Refer to
number of VPLS instances on the device”
Once the LDP session is established, the PE device advertises the local VC label, along with the
VPLS ID, to its VPLS peers in a downstream-unsolicited manner. In a similar way, the PE also learns
the remotely assigned VC labels from its VPLS peers.
To specify three remote VPLS peers within a VPLS instance, enter a command such as the
following.
Brocade(config-mpls-vpls-v1)# vpls-peer 192.168.2.100 192.168.2.101 192.168.2.102
Syntax: vpls-peer ip-addr [ip-addr...]
The IP address of each VPLS peer must match that of a destination for a tunnel LSP configured on
the device.
Setting the VPLS VC mode
The Brocade devices support the following VPLS VC modes, which determine whether or not VLAN
tags are carried across the MPLS cloud:
•
Raw mode – This is the default VC mode. When this mode is in effect, the VLAN tag information
in the original payload is not carried across the MPLS cloud
•
Tagged mode – When tagged mode is enabled, the VLAN tag information in the original
payload is carried across the MPLS cloud
VPLS raw mode
By default, VPLS packets are sent to remote peers over the MPLS cloud in raw mode. This means
that no VLAN tag information in the payload is carried across the MPLS cloud. In raw mode, the
VLAN priority (Class of Service) of the original (incoming) packets is lost once the packets are sent
through the cloud.
NOTE
When desired, the user can enable the device to preserve the VLAN tag information in the payload
and carry it across the MPLS cloud to remote peers. For more information, see
.
CoS behavior for VPLS raw mode
NOTE
This section assumes that the user understands how QoS works.
The system level command extended-qos-mode and interface level command qos pcp
encode-policy off for NetIron CES and NetIron CER affects the existing QoS behavior for raw mode
in VPLS. It is advisable to use only either raw mode or raw-pass-through-mode for all VPLS instance
in a system for NetIron CES and NetIron CER.