Information Technology Reference
In-Depth Information
IEEE 802.1p establishes eight levels (3 bits) of priority for frames; it uses a 3-bit field in
the 802.1q VLAN tagging protocol.
WRR Scheduling maps packets by using IP Precedence bits to one of four outbound WRR
queues. Each WRR queue has a different weight. More bandwidth is given to packets with
higher weights.
WRED is a congestion avoidance mechanism that implements a preferential treatment of
packets by determining which packets to drop when congestion might occur. WRED uses
the IP Precedence bits to determine which packets to drop. The higher the IP Precedence
is in a packet, the less likely the packet is dropped.
Compression Techniques
Table 11-5
Compression
Description
Stacker
Can use in HDLC interfaces; configure with compress stac
TCP header compression
Compresses TCP header, described in RFC 1144
FRF.9
Frame Relay Forum standards-based compression method on Frame Relay;
provides multivendor interoperability
RTP header compression
Compresses RTP header
 
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