Maximum number per FPC or PIC

1

8

64

64 or 58 total

On IQ2 and IQ2E PICs, the CoS classification and CoS rewrite processes are off-loaded from the FPC to the PIC, so the capabilities and limitations of these types of PICs must be taken into consideration.

For M Series router FPCs, the one-classifier limit includes the default IP precedence classifier. If you create a new classifier and apply it to an interface, the new classifier does not override the default classifier for other interfaces on the same FPC. In general, the first classifier associated with a logical interface is used. The default classifier can be replaced only when a single interface is associated with the default classifier.

Only 58 user-configurable BA classifiers can be attached to logical interfaces on Type-4 FPCs in T640, T1600, or T4000 routers, because six default classifiers are automatically attached to the interfaces. When interfaces on the FPC come up, three default classifiers are installed in the FPC ASIC table: IPv4 and IPv6, MPLS tagging, and multiservices. Next, three default BA classifiers are installed: DSCP IPv6 (9), and MPLS EXP (10), and IP precedence (13).

For user-defined BA classifier types (dscp, dscp-ipv6, ieee-802.1p, ieee-802.1ad, inet-precedence, and mpls-exp), you can attach a maximum of 32 classifiers of the same type (including one default classifier) to a logical interface hosted on a Type-4 FPC in a T640, T1600, or T4000 router.

You can attach a maximum of 8 user-configured BA classifiers of the same type to a logical interface hosted on an Enhanced Scaling FPC in a T640, T1600, or T4000 router.

dscp-ipv6

No

Yes

Yes

Yes

For T Series routers, you can apply separate classifiers for IPv4 and IPv6 packets per logical interface.

For M Series router enhanced FPCs, you cannot apply separate classifiers for IPv4 and IPv6 packets. Classifier assignment works as follows:

• If you assign a DSCP classifier only, IPv4 and IPv6 packets are classified using the DSCP classifier.
• If you assign an IP precedence classifier only, IPv4 and IPv6 packets are classified using the IP precedence classifier. The lower three bits of the DSCP field are ignored because IP precedence mapping requires the upper three bits only.
• If you assign either the DSCP or the IP precedence classifier in conjunction with the DSCP IPv6 classifier, the commit fails.
• If you assign a DSCP IPv6 classifier only, IPv4 and IPv6 packets are classified using the DSCP IPv6 classifier, but the commit displays a warning message.

inet-precedence

Yes

Yes

Yes

Yes

On all routers, you cannot assign IP precedence and DSCP classifiers to a single logical interface, because both apply to IPv4 packets.

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

No

No

No

No

–

Maximum number per FPC or PIC

2

16

32

32

–

Per loss priority

Yes

Yes

Yes

Yes

–

Traffic policing

Yes

Yes

Yes

Yes

–

Virtual channels

No

No

No

No

–

Priority

Yes

No

Yes

Yes

Gigabit Ethernet IQ2 PICs support only one queue in the scheduler map with medium-high, high, or strict-high priority. If more than one queue is configured with high or strict-high priority, the one that appears first in the configuration is implemented as strict-high priority. This queue receives unlimited transmission bandwidth. The remaining queues are implemented as low priority, which means they might be starved.

On the IQE PIC, you can rate-limit the strict-high and high queues. Without this limiting, traffic that requires low latency (delay) such as voice can block the transmission of medium-priority and low-priority packets. Unless limited, high and strict-high traffic is always sent before lower priority traffic.

Support for the medium-low and medium-high queuing priority mappings varies by FPC type.

dscp

No

Yes

Yes

Yes

For M Series Enhanced FPCs, bits 0 through 5 are rewritten, and bits 6 through 7 are preserved.

For M320 and T Series router non-IQ FPCs, bits 0 through 5 are rewritten, and bits 6 through 7 are preserved.

For M320 and T Series router FPCs, you must decode the loss priority using the firewall filter before you can use loss priority to select the rewrite CoS value.

For M320 and T Series router FPCs, Adaptive Services PIC link services IQ interfaces (lsq-) do not support DSCP rewrite markers.

frame-relay-de

No

No

No

No

–

inet-precedence

Yes

Yes

Yes

Yes

For M Series router FPCs, bits 0 through 2 are rewritten, and bits 3 through 7 are preserved.

For M Series router Enhanced FPCs, bits 0 through 2 are rewritten, bits 3 through 5 are cleared, and bits 6 through 7 are preserved.

For M320 and T Series routers FPCs, bits 0 through 2 are rewritten and bits 3 through 7 are preserved.

For M320 and T Series router FPCs, you must decode the loss priority using the firewall filter before you can use loss priority to select the rewrite CoS value.

Maximum number per PFE

64

L2 classifiers (sum of ieee-802.1 + ieee-802.1ad cannot exceed 32)

DSCP and inet-precedence classifiers (sum of dscp + inet-precedence classifiers cannot exceed 32)

dscp-ipv6 classifiers

exp classifiers

dscp-ipv6

Yes

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

inet-precedence

Yes

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

No

Maximum number

32

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

Per loss priority

Yes

Two-rate tricolor marking (TCM)

Yes

Priority

Yes (4)

dscp

Yes

ieee-802.1

Yes

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

mpls-exp

Yes