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Size Limit for IP and IPv6 CAM Hardware Classifiers

The maximum width of a CAM hardware classifier entry for IP or IPv6 in a single policy is 128 bits.

Some independent classifiers share the same classifier entry location, while others are combined together to form a larger classifier field. However, you cannot configure any combination of classifiers that exceeds the total classifier entry size of 128 bits.

IP Classifiers and Size Limits

Table 15 lists all IP classifiers and the size limit of each classifier entry.




 Table 15:  Size Limit of Individual IP Classifiers 

 IP Classifier
 Size Limit (Bits)

 Color

 2


 Destination address

 32


 Destination port

 16


 Destination route class

 8


 ICMP type

 8


 ICMP code

 8


 IGMP type

 8


 IP flags

 3


 IP fragmentation

 2


 Local

 1


 Protocol

 8


 Source address

 32


 Source port

 16


 Source route class

 8


 TCP flags

 6


 ToS

 8


 Traffic class

 3


 User packet class

 4

IP Classifier	Size Limit (Bits)
Color	2
Destination address	32
Destination port	16
Destination route class	8
ICMP type	8
ICMP code	8
IGMP type	8
IP flags	3
IP fragmentation	2
Local	1
Protocol	8
Source address	32
Source port	16
Source route class	8
TCP flags	6
ToS	8
Traffic class	3
User packet class	4

Table 16 lists the IP classifiers that share the same classifier entry location and those that are combined to form a larger classifier field. The table also lists the rules that apply to these types of classifier combinations.

The format in the classifier entry combinations in Table 16 is based on the conventions for CLI commands, except that the pipe symbol ( | ) represents a choice of one or both options to the left and right of the pipe symbol.




 Table 16:  Size Limit of Combined IP Classifiers 

 IP Classifier Entry Combination
 Size Limit (Bits)
 Rule

 Color or TCP flags or both

 8

 When you specify one or both of the color and TCP flags classifiers, 8 bits are added to the total classifier entry size.


 Destination address

 32

 –


 Destination address route class

 8

 –


 [ Destination port ] and 
[ [ ICMP type ] | [ ICMP code ] | [ IGMP type ] or nil ]

 16

 The ICMP type, ICMP code, IGMP type, and destination port classifiers share the same classifier field location.
 When you specify the destination port classifier, 16 bits are added to the total classifier entry size. If you also specify the ICMP type, ICMP code, and IGMP type classifier, no additional bits are added. 


 [ IP flags ] | [ IP fragmentation ] | [ Traffic class ] 

 8

 When you specify one or more of the IP flags, traffic class, and IP fragmentation classifiers, 8 bits are added to the total classifier entry size.


 Protocol

 8

 –


 [ Source port ] and
[ [ ICMP type ] | [ ICMP code ] | [ IGMP type ] ]

 16

 The ICMP type, ICMP code, IGMP type, and source port classifiers share the same classifier field location.
 When you specify the source port classifier, 16 bits are added to the total classifier entry size. 
 When you also specify the ICMP type, ICMP code, and IGMP type classifiers, no additional bits are added.


 Source address

 32

 –


 [ not Source port ] and [ not Destination port ] and 
[ [ ICMP type ] | [ ICMP code ] | [ IGMP type ] ]

 16

 When you do not specify the source port and destination port classifiers, but you specify one or more of ICMP type, ICMP code, and IGMP type, 16 bits are added to the total classifier entry size.
 ICMP type, ICMP code, and IGMP type require 16 bits even if the source port and destination port classifications are not configured.


 ToS

 8

 –


 User packet class or local or both

 8

 When you specify one or both of the user packet class and local classifiers, 8 bits are added to the total classifier entry size.

IP Classifier Entry Combination	Size Limit (Bits)	Rule
Color or TCP flags or both	8	When you specify one or both of the color and TCP flags classifiers, 8 bits are added to the total classifier entry size.
Destination address	32	–
Destination address route class	8	–
[ Destination port ] and [ [ ICMP type ] \| [ ICMP code ] \| [ IGMP type ] or nil ]	16	The ICMP type, ICMP code, IGMP type, and destination port classifiers share the same classifier field location. When you specify the destination port classifier, 16 bits are added to the total classifier entry size. If you also specify the ICMP type, ICMP code, and IGMP type classifier, no additional bits are added.
[ IP flags ] \| [ IP fragmentation ] \| [ Traffic class ]	8	When you specify one or more of the IP flags, traffic class, and IP fragmentation classifiers, 8 bits are added to the total classifier entry size.
Protocol	8	–
[ Source port ] and [ [ ICMP type ] \| [ ICMP code ] \| [ IGMP type ] ]	16	The ICMP type, ICMP code, IGMP type, and source port classifiers share the same classifier field location. When you specify the source port classifier, 16 bits are added to the total classifier entry size. When you also specify the ICMP type, ICMP code, and IGMP type classifiers, no additional bits are added.
Source address	32	–
[ not Source port ] and [ not Destination port ] and [ [ ICMP type ] \| [ ICMP code ] \| [ IGMP type ] ]	16	When you do not specify the source port and destination port classifiers, but you specify one or more of ICMP type, ICMP code, and IGMP type, 16 bits are added to the total classifier entry size. ICMP type, ICMP code, and IGMP type require 16 bits even if the source port and destination port classifications are not configured.
ToS	8	–
User packet class or local or both	8	When you specify one or both of the user packet class and local classifiers, 8 bits are added to the total classifier entry size.

IPv6 Classifiers and Size Limits

Table 17 lists all IPv6 and the size limit of each classifier entry.




 Table 17:  Size Limit of Individual IPv6 Classifiers 

 IPv6 Classifier Entry
 Size Limit (Bits)

 Color

 2


 Destination address

 128


 Destination port

 16


 Destination route class

 8


 ICMPv6 type

 8


 ICMPv6 code

 8


 Local

 1


 Protocol

 8


 Source address

 128


 Source port

 16


 Source route class

 8


 TC field

 8


 TCP Flags

 6


 Traffic class

 3


 User packet class

 4

IPv6 Classifier Entry	Size Limit (Bits)
Color	2
Destination address	128
Destination port	16
Destination route class	8
ICMPv6 type	8
ICMPv6 code	8
Local	1
Protocol	8
Source address	128
Source port	16
Source route class	8
TC field	8
TCP Flags	6
Traffic class	3
User packet class	4

Table 18 lists the IPv6 classifiers that share the same classifier entry location and those that are combined to form a larger classifier field. The table also lists the rules that apply to these types of classifier combinations.

The format in the classifier entry combinations in Table 18 is based on the conventions for CLI commands, except that the pipe symbol ( | ) represents a choice of one or both options to the left and right of the pipe symbol.




 Table 18:  Size Limit of Combined IPv6 Classifiers 

 IPv6 Classifier Entry Combination
 Size Limit (Bits)
 Rule

 Color or TCP flags or both

 8

 When you specify the color and/or TCP flags classifiers, 8 bits are added to the total classifier entry size.


 Destination address (first word)

 32

 –


 Destination address (second word)

 32

 –


 Destination address (third word)

 32

 –


 Destination address (fourth word)

 32

 –


 Destination address route class

 8

 –


 [ Destination port ] and
[ [ ICMPv6 type ] | [ ICMPv6 code or nil ] ]

 16

 When you specify the destination port classifier, 16 bits are added to the total classifier entry size. If you also specify the ICMPv6 type and ICMPv6 code classifiers, no additional bits are added to the total classifier entry size.


 [ No source port ] and [ no destination port ] and
[ [ ICMPv6 type ] | [ ICMPv6 code ] ]

 16

 When you do not specify the source port and destination port classifiers, and you have already specified one or more of the ICMPv6 Type and ICMPv6 code classifiers, 16 bits are added to the total classifier entry size.
 The ICMPv6 type and ICMPv6 code classifiers require 16 bits even if you have not specified the source port and destination port classifiers.


 Protocol

 8

 –


 Source address (first word)

 32

 –


 Source address (second word)

 32

 –


 Source address (third word)

 32

 –


 Source address (fourth word)

 32

 –


 Source address route class

 8

 –


 [ source port ] and 
[ [ ICMPv6 type ] | [ ICMPv6 code ] ]

 16

 When you specify the source port classifier, 16 bits are added to the total classifier entry size. If you also specify the ICMPv6 type and ICMPv6 code classifiers, no additional bits are added.


 TC field

 8

 –


 [ User packet class ] | [ traffic class ] | [ local ]

 8

 When you specify one or more of the user packet class, traffic class, and local classifiers, 8 bits are added to the total classifier entry size.

IPv6 Classifier Entry Combination	Size Limit (Bits)	Rule
Color or TCP flags or both	8	When you specify the color and/or TCP flags classifiers, 8 bits are added to the total classifier entry size.
Destination address (first word)	32	–
Destination address (second word)	32	–
Destination address (third word)	32	–
Destination address (fourth word)	32	–
Destination address route class	8	–
[ Destination port ] and [ [ ICMPv6 type ] \| [ ICMPv6 code or nil ] ]	16	When you specify the destination port classifier, 16 bits are added to the total classifier entry size. If you also specify the ICMPv6 type and ICMPv6 code classifiers, no additional bits are added to the total classifier entry size.
[ No source port ] and [ no destination port ] and [ [ ICMPv6 type ] \| [ ICMPv6 code ] ]	16	When you do not specify the source port and destination port classifiers, and you have already specified one or more of the ICMPv6 Type and ICMPv6 code classifiers, 16 bits are added to the total classifier entry size. The ICMPv6 type and ICMPv6 code classifiers require 16 bits even if you have not specified the source port and destination port classifiers.
Protocol	8	–
Source address (first word)	32	–
Source address (second word)	32	–
Source address (third word)	32	–
Source address (fourth word)	32	–
Source address route class	8	–
[ source port ] and [ [ ICMPv6 type ] \| [ ICMPv6 code ] ]	16	When you specify the source port classifier, 16 bits are added to the total classifier entry size. If you also specify the ICMPv6 type and ICMPv6 code classifiers, no additional bits are added.
TC field	8	–
[ User packet class ] \| [ traffic class ] \| [ local ]	8	When you specify one or more of the user packet class, traffic class, and local classifiers, 8 bits are added to the total classifier entry size.

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