Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 368)

340 Multi-Service IronWare Routing Configuration Guide
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Policy based routing with the preserve VLAN option
Policy based routing with the preserve VLAN option
When an IP packet matches the PBR policy with the preserve-vlan option, the Layer 2 and Layer 3
information is retained (for example, the VLAN information and the MAC address are retained). TTL
is not decremented. A packet is sent to the configured next hop. IP packets not matching the PBR
policy with preserve-vlan will be dropped. If none of the policy's direct routes or next hops is
available, the packets are forwarded as per the routing table.
Configuring a physical interface to accept all VLAN packets
for PBR
The allow-all-vlan pbr command configures a physical interface to accept all VLAN packets for the
purpose of PBR. This command reduces configuration complexity since the physical interface does
not have to be configured individually in multiple VLAN interfaces.
Syntax: allow-all-vlan pbr
NOTE
The allow-all-vlan pbr command cannot be applied to a VE.
Configuration considerations
• The command allow-all-vlan pbr cannot be configured when the physical port is configured
with an IPv4 address, MPLS, VPLS, VLL, ICL, Layer 3 VPN; or when the port is part of other
VLAN.
• The route map with preserve-vlan set policies cannot be configured globally.
• A route map used for PBR with a preserve VLAN policy must have the preserve-vlan keyword
configured for each set policy.
Configuring policy based routing with the preserve VLAN
option
The interface, on which PBR with preserve-vlan is configured, should be part of the VLANs through
which packets are expected. A route map policy with set policies to preserve VLAN can be applied
on a physical port or on a VE port.
Preserve VLAN option as part of a set policy
In a route map set policy configuration, the preserve-vlan keyword is used to preserve the packet.
Syntax: set ip next-hop ip-address preserve-vlan
Syntax: set next-hop-flood-vlan vlan-id preserve-vlan
Syntax: set interface ethernet slot/port preserve-vlan
Configuring a rule-name for a route-map
You can use the rule-name field in the route-map to organize and extract information about PBR
configurations.