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Configuring DLSw Services
6-2 114063 Rev. A
As a router operates, network traffic from a variety of sources converges at an
interface. Without protocol prioritization, the router transmits packets in a first in
first out (FIFO) order. Site Manager’s protocol prioritization features allow you to
instruct the router to use a different transmit order for specified ranges of packets
on an individual interface.
With protocol prioritization, the router sorts traffic into queues according to
priority filters that you configure. For most traffic, you configure priority filters on
an outbound interface. If a queue is full or you have configured an outbound drop
filter, the router discards (clips) the traffic. For DLSw traffic you can also create
priority queues for DLSw peers; the router cannot clip DLSw traffic.
The router holds the sorted packets in priority queues. It then uses a dequeuing
allocation algorithm to drain the queues and transmit traffic.
Priority queues do not affect traffic as it is entering the router, but rather affects the
sequence in which data leaves an interface. For this reason, protocol prioritization
is considered an outbound filter mechanism.
Two Types of Protocol Prioritization
There are two separate implementations of protocol priority queuing. For all
synchronous protocols that support outbound traffic filters, Bay Networks
supports a high, normal, and low priority queue at the circuit interface level. For
inbound and outbound DLSw traffic, Bay Networks also supports one to ten
queues at the TCP level for DLSw peers.
Using existing protocol prioritization support, you can prioritize DLSw traffic
before other protocols. DLSw protocol prioritization prioritizes specific types of
DLSw traffic, such as:
Ethernet
Frame Relay
SDLC
Token Ring
Other SRB traffic
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