MPLS and RSVP
7450 ESS MPLS Guide Page 85
destination MAC address to be configured. An unnumbered MPLS-TP interface is configured
using the unnumbered-mpls-tp keyword, as follows:
config
router
interface <if-name> [unnumbered-mpls-tp]
port <port-id>[:encap-val]
mac <local-mac-address>
static-arp <remote-mac-addr>
//ieee-address needs to support mcast and bcast
exit
The remote-mac-address may be any unicast, broadcast of multicast address. However, a
broadcast or multicast remote-mac-address is only allowed in the static-arp command on Ethernet
unnumbered interfaces when the unnumbered-mpls-tp keyword has been configured. This also
allows the interface to accept packets on a broadcast or any multicast MAC address. Note that if a
packet is received with a unicast destination MAC address, then it will be checked against the
configured <local-mac-address> for the interface, and dropped if it does not match. When an
interface is of type unnumbered-mpls-tp, only MPLS-TP LSPs are allowed on that interface;
other protocols are blocked from using the interface.
An unnumbered MPLS-TP interface is assumed to be point-to-point, and therefore users must
ensure that the associated link is not broadcast or multicast in nature if a multicast or broadcast
remote MAC address is configured.
The following is a summary of the constraints of an unnumbered MPLS-TP interface:
• It is unnumbered and may borrow/use the system interface address
• It prevents explicit configuration of a borrowed address
• It prevents IP address configuration
• It prevents all protocols except mpls
• It prevents Deletion if an MPLS-TP LSP is bound to the Interface
• It is allowed only in network chassis mode D
MPLS-TP is only supported over Ethernet ports in Release 11.0. The system will block the
association of an MPLS-TP LSP to an interface whose port is non-Ethernet.
If required, the IF_Num is configured under a MEP context under the MPLS interface. The mpls-
tp-mep context is created under the interface as shown below. The if-num parameter, when
concatenated with the Node ID, forms the IF_ID (as per RFC 6370), which is the identifier of this
MEP. Note that it is possible to configure this context whether the interface is IP numbered, IP
unnumbered or mpls-tp unnumbered:
config
router
mpls
interface <ip-int-name>
mpls-tp-mep
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