Static Mapping command Examination
We earlier discussed that Cisco routers support all network layer protocols over Frame Relay. We also know that the address-to-DLCI mapping can be accomplished both by dynamic or static mapping. Frame Relay static mapping ever depends on the network needs. To map between a next-hop protocol address and a DLCI destination address, the following command syntax can be used:
frame-relay map protocol protocol-address dlci[broadcast] [ietf] [cisco].
The “ietf” parameter can be used to connect a non-Cisco router.
Another command parameter is “broadcast,” which specifies that broadcast and multicast traffic are permitted over the VC and permits the use of dynamic routing protocols. Due to the broadcast, the Open Shortest Path First (OSPF) protocol configuration can be significantly simplified.
Frame Relay, ATM, and X.25 are non-broadcast multiaccess (NBMA) networks. Non-broadcast multiaccess (NBMA) based networks only allow data transfer from point to point, over a VC, or across a switching device. Non-broadcast multiaccess (NBMA) networks do not allow multicasting or broadcasting; therefore, a single packet cannot reach all destinations.
A single packet is required to replicate the packets manually to all destinations. Using the broadcast keyword is a way to send and forward routing updates. The broadcast keyword supports IPv4 broadcasts and multicasts propagating to all nodes. Broadcast also allows IPv6 multicasts over the PVC. When this keyword is enabled, the router converts the broadcast or multicast traffic into unicast traffic so that other nodes receive the routing updates.
The “protocol” parameters define the supported protocols, bridging, or logical link control: IPv4, IPv6, Apple Talk, DECnet, dlsw, ipx, rsrb, vies, llc2, and xns.
The “procol address” defines the network layer address of the destination router interface.
The “dlci” defines the local DLCI used to connect to the remote protocol address.