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Configuring MPOA and NHRP Services

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The MPC monitors traffic flows between a local source and remote

destinations. When traffic volume between a source and a destination exceeds

a preconfigured threshold level (for example x packets to the same network

layer address in y seconds), the MPC attempts to set up an SVC between the

source and destination workstations.

In attempting to set up an SVC, the MPC first looks in a local cache of

network layer-to-ATM address mappings. If the MPC finds the destination

address in its local cache, it immediately begins to establish the SVC. If it fails

to locate the destination address in the local cache, it generates an MPOA

address resolution request to an adjacent MPOA server.

• MPOA routers

Each MPOA router that serves MPCs, directly or indirectly, includes a

collection of logical functions that map network layer addresses to ATM

addresses. Each MPOA router maintains tables of adjacent network layer (IP),

MAC layer, and ATM addresses, in addition to standard routing tables derived

from a routing protocol (generally OSPF or RIP).

MPOA routers communicate over NHRP to map network layer addresses to

ATM addresses. BayRS provides MPOA router functionality to map IP

addresses to their ATM counterparts.

• MPOA servers

The MPOA server (MPS) is a logical function that mediates between local

MPCs and the MPOA router. It receives MPOA address resolution requests

from MPCs and passes them to the MPOA routing function. The MPOA

router, using NHRP, resolves the address and passes the requested ATM

address back to the MPS. The MPS, in turn, forwards the resolved address to

the requesting MPC. BayRS provides MPOA server functionality.

MPOA Basic Elements

MPOA services provided by each Nortel Networks router depend on the existence

of:

• An ATM emulated LAN (using LANE) between each MPC and its MPS.

• An ATM emulated LAN, ATM Classical IP (RFC 1577 SVC), or an ATM

PVC between any two MPSs. (See Figure 1-1 on page 1-2

• NHRP to resolve ATM and IP source and destination addresses.

• IP to route NHRP packets and other traffic between MPSs.

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Avaya Configuring MPOA Services Manual de usuario Pagina 24