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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
|
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.
|
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
|
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.
|
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