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DLSw Implementation Notes

2-11

Multiple DLSw Peers on a LAN

You can conﬁgure two or more DLSw nodes on the same SRB LAN. With this

conﬁguration, each DLSw peer reaches a different set of remote NetBIOS and

SNA systems. In this case,

• Do not deﬁne a TCP connection between these Data Link Switches.

• Assign the same Virtual Ring IDs to each peer.

Taking these precautions prevents frames sent by one DLSw node from

propagating through the other DLSw node on the same SRB LAN.

DLSw and Bridging Services

This section presents the different types of bridging services that coexist on a

circuit with DLSw, and explains any differences in TEST or explorer frame

handling on these circuits. This information is useful when you examine trafﬁc on

LANs locally attached to the router.

DLSw on an SRB Circuit

On an SRB circuit with DLSw services enabled (Figure 2-9), the following rules

apply:

• Upon receiving an explorer frame that contains a DLSw-speciﬁc destination

SAP address, DLSw and SRB attempt concurrently to locate the requested

program entity.

— DLSw searches the network for a route to the target system by forwarding

the packet to all local DLSw interfaces and all known remote DLSw

routers.

— SRB looks for a bridged path to the target system using standard source

route bridge broadcasts.

Note: Do not conﬁgure multiple Data Link Switches on an Ethernet/802.3

LAN. Ethernet/802.3 LANs do not support loop prevention through source

routing.

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Avaya Configuring DLSw Services Manual do Utilizador Página 49