configure diffserv dscp-mapping ports
ExtremeWare 7.5 Command Reference Guide
2117
configure diffserv dscp-mapping ports
configure diffserv dscp-mapping <input_codepoint>/<output_codepoint> ports
<portlist> {egress {no-congestion | congestion} | ingress}
Description
Configures a mapping between an input DiffServ code point (DSCP) and an associated output DSCP for
the specified PoS or ATM ports.
Syntax Description
Default
By default, all the tables are initialized such that DSCPs are not altered by the mapping operations; for
example, an input DSCP value of n is always mapped to an output DSCP value of n. Additionally,
dscp-mapping
is performed without regard to whether
diffserv examination
is enabled on the port.
Usage Guidelines
Three DSCP mapping tables are supported per SONET port. One of the tables is used in the ingress
direction and two are used for egress flows (onto the SONET link). The two egress tables are for the
congested and non-congested states, as determined by the RED algorithm (in other words, the
congested state is when the average queue length is greater than the minimum RED threshold). If RED
is not enabled on the SONET port, then the egress congested-state mapping table is not used.
The tables are very simple. In the ingress direction, the input DSCP of a packet received from the
SONET link is replaced with an output DSCP before the packet is forwarded. The replacement is
straightforward; the input DSCP is used as an index into a 64-entry table that contains the output
DSCPs associated with each of the input DSCP values. The operation is similar in the egress direction,
with the DSCP mapping occurring before the packet is transmitted onto the SONET link(s). The
mapping operation is performed after the packet has been assigned to a QoS profile. One potential use
of the DSCP mapping capability is reconciliation of varying DiffServ policies at the boundary between
autonomous systems (for example, at the boundary between two ISPs). The availability of different
tables for the congested/non-congested states is useful for marking operations that increase the drop
probability of packets during times of congestion, as discussed in the DiffServ assured forwarding (AF)
RFC.
input_codepoint
Specifies one of the 64 possible DiffServ code point values as the input code
point.
output_codepoint
Specifies one of the 64 possible DiffServ code point values as the output code
point.
portlist
Specifies the port number(s).
egress
Applies the DSCP mapping to the egress direction.
no-congestion
Applies the DSCP mapping to the egress mapping table for the non-congested
state.
congestion
Applies the DSCP mapping to the egress mapping table for the congested
state.
ingress
Applies the DSCP mapping to the ingress direction.
Summary of Contents for ExtremeWare 7.5
Page 402: ...402 ExtremeWare 7 5 Command Reference Guide VLAN Commands ...
Page 470: ...470 ExtremeWare 7 5 Command Reference Guide QoS Commands ...
Page 490: ...490 ExtremeWare 7 5 Command Reference Guide NAT Commands ...
Page 826: ...826 ExtremeWare 7 5 Command Reference Guide Commands for Status Monitoring and Statistics ...
Page 1090: ...1090 ExtremeWare 7 5 Command Reference Guide Security Commands ...
Page 1386: ...1386 ExtremeWare 7 5 Command Reference Guide Wireless Commands ...
Page 1436: ...1436 ExtremeWare 7 5 Command Reference Guide EAPS Commands ...
Page 1568: ...1568 ExtremeWare 7 5 Command Reference Guide ESRP Commands ...
Page 1844: ...1844 ExtremeWare 7 5 Command Reference Guide IGP Commands ...
Page 1930: ...1930 ExtremeWare 7 5 Command Reference Guide BGP Commands i Series Switches Only ...
Page 2022: ...2022 ExtremeWare 7 5 Command Reference Guide IP Multicast Commands ...
Page 2066: ...2066 ExtremeWare 7 5 Command Reference Guide IPX Commands i Series Platforms Only ...
Page 2082: ...2082 ExtremeWare 7 5 Command Reference Guide ARM Commands BlackDiamond Switch Only ...
Page 2094: ...2094 ExtremeWare 7 5 Command Reference Guide Remote Connect Commands ...
Page 2174: ...2174 ExtremeWare 7 5 Command Reference Guide PoS Commands BlackDiamond Switch Only ...
Page 2372: ...2372 ExtremeWare 7 5 Command Reference Guide LLDP Commands ...
Page 2422: ...2422 ExtremeWare 7 5 Command Reference Guide H VPLS Commands BlackDiamond Switch Only ...
Page 2528: ...2528 ExtremeWare 7 5 Command Reference Guide MPLS Commands BlackDiamond Switch Only ...
