Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 843)

TABLE 162 Differences in the 6PE CoS behavior on the Brocade devices
Behavior of Brocade MLXe series and Brocade NetIron
XMR devices Behavior of Brocade NetIron CES and Brocade NetIron CER
devices
At the ingress router, the tunnel and 6PE label EXP
bits are set to internal priority. When the tunnel has a
configured CoS value, the configured value overrides
the internal priority.
At the transit router, when the port encode EXP bit is
set, then both the MPLS tunnel EXP and 6PE label
EXP bits are overwritten from the encoding table.
At the PHP router, the tunnel label is popped and the
6PE label keeps its EXP value unchanged.
At the egress router, the 6PE label is popped and the
IPv6 packet keeps its DSCP value unchanged.
When the port encode DSCP bit is set, then the IPv6
DSCP value is overwritten from the encoding table.
At the ingress router, the tunnel and 6PE label EXP bits
are set to internal priority. When the tunnel has a
configured CoS value, the configured value overrides the
internal priority.
At the transit router, when the port encode EXP bit is set,
then only the MPLS tunnel EXP bit is overwritten from the
encoding table.
At the PHP router, the tunnel label is popped and the 6PE
label keeps its EXP value unchanged.
At the egress router, the 6PE label is popped and the
DSCP value in the IPv6 header is updated based on the
DSCP encode policy. For these devices, the DSCP encode
policy cannot be switched off.
Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 819
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6VPE Routing
9
6VPE Routing
IPv6 VPN Provider Edge Router (6VPE) routing enables connecting two IPv6 private networks over
IPv4-based MPLS public network, as described in RFC 4798. The 6VPE router can be an existing
Provider Edge (PE) router or a new PE router dedicated to IPv6 traffic. The Provider Edge (PE) router
supports dual stack IPv4 and IPv6. Similar to L3VPN, the 6VPE router utilizes the existing MPLS
backbone to forward IPv6 traffic from PE to PE using the MPLS labels.
6VPE overview
Figure 96 is the network topology for 6VPE.
FIGURE 96 6VPE topology
The 6VPE network consists of the following key elements in the topology.