Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 909)

Multi-Service IronWare Switching Configuration Guide 879
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RPF configuration
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• You cannot configure RPF on a physical port that belongs to a virtual LAN (VLAN).
• If a combination of RPF, PBR, and ACL are configured on an interface, RPF takes precedence.
• The section “Special considerations for configuring RPF with ECMP routes” does not apply to
the Brocade NetIron CES and Brocade NetIron CER devices.
Special considerations for configuring RPF
with ECMP routes
NOTE
This section applies only to the Brocade NetIron XMR and Brocade MLX series devices.
RPF for IPv6 is not subject to the special considerations for configuring RPF with ECMP routes
described in this section.
For a source IP address matching an ECMP route, RPF permits the packet if it arrives on any of the
next-hop interfaces for that route. For example, if there are two best next hops for a network route
10.11.11.0/24, one pointing to 10.10.10.1 (Gigabit Ethernet 7/1) and the other to 10.10.30.1
(Gigabit Ethernet 7/12), then incoming packets with a source address matching 10.11.11.0/24 will
be permitted on either Gigabit Ethernet 7/1 or Gigabit Ethernet 7/12.
A disadvantage of this configuration is that if some other route shares any of these next hops, the
packets with a source IP address matching that route are also permitted from any of the interfaces
associated with those next hops. For example, if 10.12.12.0/24 has the next hop 10.10.10.1, then
packets from 10.12.12.0/24 are also permitted on either Gigabit Ethernet 7/1 or Gigabit Ethernet
7/12.
RPF support for IP over MPLS routes
For IPv4 routes over MPLS tunnels, the physical interface for an outgoing tunnel on which a route is
assigned may not be the same as the one from which you receive packets. Consequently, only RPF
loose mode is supported on MPLS uplinks. IPv6 is not currently supported over MPLS. When it is
supported, it will only support RPF loose mode on MPLS uplinks.
RPF-compatible CAM profiles
NOTE
This section applies only to the Brocade NetIron XMR and Brocade MLX series devices.
Not all CAM profiles are compatible with RPF. Table 116 lists all of the RPF-compatible CAM profiles
by software release. Refer to “CAM partition profiles” for a description of each of the available CAM
profiles.
TABLE 116 RPF compatible and non-compatible CAM profiles
Software release Compatible CAM profiles Non-compatible CAM profiles
XMR or MLX
03.2.00 and later
default ipv4-ipv6
ipv4 ipv4-vpls
ipv4-vpn l2-metro