Avaya Configuring DLSw Services Bedienungsanleitung PDF herunterladen (Seite 56)

Configuring DLSw Services

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Performance

In a DLSw conﬁguration that includes a single IP virtual ring, the operation of

three connection-oriented protocol components (two LLC2 and one TCP) in the

data path between endstations may affect end-to-end performance. Performance

delays increase for DLSw conﬁgurations that include more than one IP virtual

ring in any end-to-end connection path. (For more information on DLSw

conﬁgurations that include multiple IP virtual rings in an end-to-end connection

path, contact the Bay Networks Technical Response Center.)

You can make determinations of DLSw latency, based on your experience with

speciﬁc SNA and NetBIOS applications. Consider also the inherent latency of the

physical data links that interconnect each pair of DLSw peers.

DLSw Packaging

In DLSw dual switch conﬁgurations, packaging allows multiple DLSw frames

(consisting of user data and the DLSw SSP header) to be placed into a single TCP/

IP frame. This provides two performance beneﬁts:

• Reduces the number of TCP/IP encapsulation program executions. This

results in fewer router cycles when processing DLSw information.

• Reduces the amount of TCP/IP overhead per DLSw frame. Instead of 52 bytes

of overhead per information frame (32 for TCP, 20 for IP), a single TCP/IP

package carries multiple frames.

With DLSw packaging, a packet may be delayed for a short period while the

router waits to see whether there are any more packets routed to the same

destination peer. This delay may increase network latency. However, the

performance beneﬁts increase the number of packets that can be delivered across

the network, increasing response time. DLSw packaging is important for networks

with many LAN/WAN segments and for networks with slow WAN links.

For information on conﬁguring DLSw packaging parameters, refer to Chapter 5.

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Avaya Configuring DLSw Services Bedienungsanleitung Seite 56