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Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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deny udp

To drop user datagram protocol (UDP) packets meeting the filter criteria, configure a filter.

Syntax deny udp { source mask | any | host ip-address} [ operator port [ port]] { destination mask | any | host ip-address} [dscp] [operator port [ port]] [count [byte]] [order] [fragments] [threshold-in-msgs [count]]
To remove this filter, you have two choices:
  • Use the no seq sequence-number command if you know the filter’s sequence number.
  • Use the no deny udp { source mask | any | host ip-address} { destination mask | any | host ip-address} command.
Parameters
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 then the IP address to specify a host IP address.
dscp Enter this keyword dscp to deny a packet based on the DSCP value. The range is from 0 to 63.
operator (OPTIONAL) Enter one of the following logical operand:
  • eq = equal to
  • neq = not equal to
  • gt = greater than
  • lt = less than
  • range = inclusive range of ports (you must specify two ports for the port command)
port port

Enter the application layer port number. Enter two port numbers if using the range logical operand. The range is from 0 to 65535.

destination Enter the IP address of the network or host to which the packets are 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.
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.
order (OPTIONAL) Enter the keyword order to specify the QoS priority for the ACL entry. The range is from 0 to 254 (where 0 is the highest priority and 254 is the lowest; lower-order numbers have a higher priority) If you did not use the keyword order, the ACLs have the lowest order by default ( 255).
fragments Enter the keyword fragments to use ACLs to control packet fragments.
threshold-in-msgs count (OPTIONAL) Enter the threshold-in-msgs keyword then a value to indicate the maximum number of ACL logs that can be generated, exceeding which the generation of ACL logs are terminated with the seq, permit, or deny commands. The threshold range is from 1 to 100.
Defaults By default 10 ACL logs are generated if you do not specify the threshold explicitly. The default frequency at which the ACL logs are generated is five minutes.
Command Modes CONFIGURATION-IP ACCESS-LIST-EXTENDED
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.3(0.0) Added the support for logging of ACLs on the MXL 10/40GbE Switch IO Module platform.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information

The order option is relevant in the context of the Policy QoS feature only. For more information, refer to the Quality of Service chapter of the Dell Networking OS Configuration Guide .

You can configure either count (packets) or count (bytes). However, for an ACL with multiple rules, you can configure some ACLs with count (packets) and others as count (bytes) at any given time.

Most ACL rules require one entry in the CAM. However, rules with TCP and UDP port operators (for example, gt, lt or range) may require more than one entry. The range of ports is configured in the CAM based on bit mask boundaries; the space required depends on exactly what ports are included in the range.

When the configured maximum threshold is exceeded, generation of logs is stopped. When the interval at which ACL logs are configured to be recorded expires, the subsequent, fresh interval timer is started and the packet count for that new interval commences from zero. If ACL logging was stopped previously because the configured threshold is exceeded, it is re-enabled for this new interval.

If ACL logging is stopped because the configured threshold is exceeded, it is re-enabled after the logging interval period elapses. ACL logging is supported for standard and extended IPv4 ACLs, IPv6 ACLs, and MAC ACLs. You can configure ACL logging only on ACLs that are applied to ingress interfaces; you cannot enable logging for ACLs that are associated with egress interfaces

Example

An ACL rule with a TCP port range of 4000–8000 uses eight entries in the CAM. 

Dell#  Data             Mask        From To #Covered
                                             
                                             1 0000111110100000 1111111111100000 4000 4031 32
                                             2 0000111111000000 1111111111000000 4032 4095 64
                                             3 0001000000000000 1111100000000000 4096 6143 2048
                                             4 0001100000000000 1111110000000000 6144 7167 1024
                                             5 0001110000000000 1111111000000000 7168 7679 512
                                             6 0001111000000000 1111111100000000 7680 7935 256
                                             7 0001111100000000 1111111111000000 7936 7999 64
                                             8 0001111101000000 1111111111111111 8000 8000 1
                                             
                                             Total Ports: 4001
Example

An ACL rule with a TCP port lt 1023 uses only one entry in the CAM. 

Dell# Data              Mask        From To   #Covered
                                             
                                             1 0000000000000000 1111110000000000 0    1023 1024
                                             
                                             Total Ports: 1024
Related Commands

deny — assigns a filter to deny IP traffic.

deny tcp — assigns a filter to deny TCP traffic.

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