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
Maximum number per PFE
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 and IP precedence classifiers cannot be configured on the same logical interface.
Separate classifiers can be applied for IPv4 and IPv6 packets per logical interface.
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.
Note: MPLS EXP classifiers are not supported on PTX10001-20C routers.
Loss priorities based on the Frame Relay discard eligible (DE) bit
You can configure up to 32 drop-profiles in the PTX chassis.
Per loss priority
Note: Packet loss priority medium-low is not supported on PTX1000 routers.
Per Transmission Control Protocol (TCP) bit
Note: PTX10001-36MR, PTX10008, and PTX10016 routers support a maximum of two drop profile points (fill level/drop probability pairs) per drop profile:
Two-rate tricolor marking (TCM)
Note: Tri-color marking is not supported on PTX1000 routers.
Per-queue output statistics
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.
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.
Maximum number per PFE
The sum of L2 and L3 rewrite rules cannot exceed 64.
Note: Rewrite rules are not supported on PTX10001-20C routers.
L2 and L3 rewrites can be applied to the same packet simultaneously.