This feature allows the use of a 362-bit double-wide match key instead of a standard 181-bit single-wide key to be used with match conditions. A double-wide match key allows you to add more match conditions to an ACL. It also allows matching on a full destination-source IPv6 address.
OVID, DIP, SIP, IpInfo(First-Fragment,Fragments), IP-Proto, DSCP, TCP-Flag, L4SP, L4DP
SIPv6, IP-Proto, DSCP, TCP-Flag, L4SP, L4DP
For example, your single-wide mode supports condition combination A, B, and C, and the double-wide mode adds condition combinations D1 and D2. Then in a single-wide mode, the conditions of your rule should be a subset of either {A}, or {B}, or {C} and in a double-wide mode, the conditions of your rule should be a subset of either {A U D1}, or {A U D2}, or {B U D1}, or {B U D2}, or {C U D1}, or {C U D2}.
The platforms that support this feature can operate either in double-wide mode or in the current single-wide mode. A individual switch cannot be configured to operate in a mixed double and single-wide mode. However, a SummitStack can have a mixture of modules and switches with some of them operating in a single-wide mode and some in a double-wide mode.
Double-wide mode provides richer condition combinations. However, when in a double-wide mode, you can install only one half as many rules into the internal ACL TCAM as you can when in a single-wide mode.
Double-wide mode is supported only by internal TCAM hardware. External TCAM hardware does not support this feature and thus is not applicable to external TCAM ACLs.
Only ingress ACLs support this feature. Egress and external ACLs do not support it.
Wide Key ACLs are available on Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X620 switches.