Cisco Nexus 5500 Series - interface ethernet

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Cisco Nexus 5500 Series NX-OS Security Command Reference
OL-27883-02
Chapter D Commands
deny icmp (IPv6)
Command Modes IPv6 ACL configuration
Command History
Usage Guidelines A newly created IPv6 ACL contains no rules.
When the device applies an IPv6 ACL to a packet, it evaluates the packet with every rule in the ACL.
The device enforces the first rule whose conditions are satisfied by the packet. When the conditions of
more than one rule are satisfied, the device enforces the rule with the lowest sequence number.
Source and Destination
You can specify the source and destination arguments in one of several ways. In each rule, the method
you use to specify one of these arguments does not affect how you specify the other. When you configure
a rule, use the following methods to specify the source and destination arguments:
• Address and variable-length subnet mask—You can use an IPv6 address followed by a
variable-length subnet mask (VLSM) to specify a host or a network as a source or destination. The
syntax is as follows:
IPv6-address/prefix-len
This example shows how to specify the source argument with the IPv6 address and VLSM for the
2001:0db8:85a3:: network:
switch(config-acl)# deny icmp 2001:0db8:85a3::/48 any
• Host address—You can use the host keyword and an IPv6 address to specify a host as a source or
destination. The syntax is as follows:
host IPv6-address
This syntax is equivalent to IPv6-address/128.
This example shows how to specify the source argument with the host keyword and the
2001:0db8:85a3:08d3:1319:8a2e:0370:7344 IPv6 address:
switch(config-acl)# deny icmp host 2001:0db8:85a3:08d3:1319:8a2e:0370:7344 any
• Any address—You can use the any keyword to specify that a source or destination is any IPv6
address. For examples of the use of the any keyword, see the examples in this section. Each example
shows how to specify a source or destination by using the any keyword.
ICMPv6 Message Types
The icmp-message argument can be the ICMPv6 message number, which is an integer from 0 to 255. It
can also be one of the following keywords:
• beyond-scope—Destination beyond scope
• destination-unreachable—Destination address is unreachable
• echo-reply—Echo reply
• echo-request—Echo request (ping)
• header—Parameter header problems
Release Modification
5.2(1)N1(1) This command was introduced.