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CoS Features and Limitations on PTX Series Routers

 

Table 1 summarizes CoS features and limitations on PTX Series Packet Transport Routers.

The following table lists the CoS features supported on the PTX Series router, as well as the limitations relevant to the PTX Series router. Note that this list is a subset of the overall CoS feature set.

Table 1: CoS Features and Limitations on PTX Series Routers

CoS Feature

Capacity

Comments

Classifiers

Maximum number per PFE

64

L2 classifiers (sum of IEEE-802.1p and IEEE-802.1ad cannot exceed 32)

DSCP and IP precedence classifiers (sum of DSCP and IP precedence classifiers cannot exceed 32)

DSCP IPv6 classifiers

MPLS EXP classifiers

dscp

Yes

DSCP and IP precedence classifiers cannot be configured on the same logical interface.

dscp-ipv6

Yes

Separate classifiers can be applied for IPv4 and IPv6 packets per logical interface.

ieee-802.1p

Yes

You can associate IEEE-802.1p with any other type of classifier on the same logical interface. For L3 packets, an L3 classifier takes precedence over an IEEE classifier.

Note: IEEE classifiers are not supported on PTX10001-20C routers.

inet-precedence

Yes

 

mpls-exp

Yes

Note: MPLS EXP classifiers are not supported on PTX10001-20C routers.

Loss priorities based on the Frame Relay discard eligible (DE) bit

No

 
Drop Profiles

Maximum number

32

You can configure up to 32 drop profiles in the PTX chassis.

Per queue

Yes

 

Per loss priority

Yes

Note: Packet loss priority medium-low is not supported on PTX1000 routers.

Per Transmission Control Protocol (TCP) bit

No

 
Policing

Traffic policing

Yes

 

Two-rate tricolor marking (TCM)

Yes

Note: Tri-color marking is not supported on PTX1000 routers.

Queuing

Priority

Yes (4)

 

Per-queue output statistics

Yes

Red-dropped counters are not maintained per drop precedence. Also tail drop counters always show zero because packets are always dropped by the RED algorithm.

transmit-rate percent

Yes

Percentage transmit rate for a scheduler has the range 1 through 100 percent. The range is 0 through 100 percent for M, MX and T Series routers and EX Series switches; and 0 through 200 percent for the SONET/SDH OC48/STM16 IQE PIC.

On PTX Series routers, unconfigured interfaces are equivalent to percent 0.

Rewrite Markers

Maximum number per PFE

64

The sum of L2 and L3 rewrite rules cannot exceed 64.

Note: Rewrite rules are not supported on PTX10001-20C routers.

dscp

Yes

 

dscp-ipv6

Yes

 

ieee-802.1

Yes

L2 and L3 rewrites can be applied to the same packet simultaneously.

inet-precedence

No

 

mpls-exp

Yes