Reference Guide

Access Control Lists (ACL) | 237
permit icmp
e
Configure a filter to allow all or specific ICMP messages.
Syntax
permit icmp {source mask | any | host ip-address} {destination mask | any | host
ip-address} [dscp] [message-type] [count [byte] | log] [order] [monitor] [fragments]
To remove this filter, you have two choices:
• Use the no seq sequence-number command syntax if you know the filter’s sequence number
or
• Use the no permit icmp {source mask | any | host ip-address} {destination mask | any |
host ip-address} command.
Parameters
Defaults
Not configured
Command Modes
CONFIGURATION-STANDARD-ACCESS-LIST
Command
History
source
Enter the IP address of the network or host from which the packets were sent.
mask
Enter a network mask in /prefix format (/x) or A.B.C.D. The mask, when specified in
A.B.C.D format, may be either contiguous or non-contiguous.
any Enter the keyword any to specify that all routes are subject to the filter.
host ip-address Enter the keyword host followed by the IP address to specify a host IP address.
destination
Enter the IP address of the network or host to which the packets are sent.
dscp
Enter this keyword to deny a packet based on DSCP value.
Range: 0-63
message-type
(OPTIONAL) Enter an ICMP message type, either with the type (and code, if
necessary) numbers or with the name of the message type (ICMP message types are
listed in Table 9-2).
Range: 0 to 255 for ICMP type; 0 to 255 for ICMP code
count (OPTIONAL) Enter the keyword count to count packets processed by the filter.
byte (OPTIONAL) Enter the keyword byte to count bytes processed by the filter.
log (OPTIONAL, E-Series only) Enter the keyword log to have the information kept in
an ACL log file.
order (OPTIONAL) Enter the keyword order to specify the QoS priority for the ACL
entry.
Range: 0-254 (where 0 is the highest priority and 254 is the lowest; lower order
numbers have a higher priority)
Default: If the order keyword is not used, the ACLs have the lowest order by default
(255).
monitor (OPTIONAL) Enter the keyword monitor to monitor traffic on the monitoring
interface specified in the flow-based monitoring session along with the filter
operation.
fragments Enter the keyword fragments to use ACLs to control packet fragments.
Version 8.3.1.0
Added
dscp keyword.
Version 8.2.1.0 Allows ACL control of fragmented packets for IP (Layer 3) ACLs.
Version 8.1.1.0 Introduced on E-Series ExaScale