Deployment Guide

Continue Clause
Normally, when a match is found, set clauses are executed, and the packet is then forwarded; no more route-map modules are processed.
If you congure the continue command at the end of a module, the next module (or a specied module) is processed even after a match
is found. The following example shows a continue clause at the end of a route-map module. In this example, if a match is found in the
route-map “test” module 10, module 30 is processed.
NOTE: If you congure the continue clause without specifying a module, the next sequential module is
processed.
Example of Using the continue Clause in a Route Map
!
route-map test permit 10
match commu comm-list1
set community 1:1 1:2 1:3
set as-path prepend 1 2 3 4 5
continue 30!
Logging of ACL Processes
To assist in the administration and management of trac that traverses the device after being validated by the congured ACLs, you can
enable the generation of logs for access control list (ACL) processes. Although you can congure ACLs with the required permit or deny
lters to provide access to the incoming packet or disallow access to a particular user, it is also necessary to monitor and examine the
trac that passes through the device. To evaluate network trac that is subjected to ACLs, congure the logs to be triggered for ACL
operations. This functionality is primarily needed for network supervision and maintenance activities of the handled subscriber trac.
When ACL logging is congured, and a frame reaches an ACL-enabled interface and matches the ACL, a log is generated to indicate that
the ACL entry matched the packet.
When you enable ACL log messages, at times, depending on the volume of trac, it is possible that a large number of logs might be
generated that can impact the system performance and eciency. To avoid an overload of ACL logs from being recorded, you can
congure the rate-limiting functionality. Specify the interval or frequency at which ACL logs must be triggered and also the threshold or
limit for the maximum number of logs to be generated. If you do not specify the frequency at which ACL logs must be generated, a default
interval of 5 minutes is used. Similarly, if you do not specify the threshold for ACL logs, a default threshold of 10 is used, where this value
refers to the number of packets that are matched against an ACL .
A Layer 2 or Layer 3 ACL contains a set of dened rules that are saved as ow processor (FP) entries. When you enable ACL logging for a
particular ACL rule, a set of specic ACL rules translate to a set of FP entries. You can enable logging separately for each of these FP
entries, which relate to each of the ACL entries congured in an ACL. Dell Networking OS saves a table that maps each ACL entry that
matches the ACL name on the received packet, sequence number of the rule, and the interface index in the database. When the
congured maximum threshold has exceeded, log generation stops. When the interval at which ACL logs are congured to be recorded
expires, a fresh interval timer starts and the packet count for that new interval commences from zero. If ACL logging was stopped
previously because the congured threshold has exceeded, it is reenabled for this new interval.
The ACL application sends the ACL logging conguration information and other details, such as the action, sequence number, and the ACL
parameters that pertain to that ACL entry. The ACL service collects the ACL log and records the following attributes per log message.
• For non-IP packets, the ACL name, sequence number, ACL action (permit or deny), source and destination MAC addresses, EtherType,
and ingress interface are the logged attributes.
• For IP Packets, the ACL name, sequence number, ACL action (permit or deny), source and destination MAC addresses, source and
destination IP addresses, and the transport layer protocol used are the logged attributes.
• For IP packets that contain the transport layer protocol as Transmission Control Protocol (TCP) or User Datagram Protocol (UDP), the
ACL name, sequence number, ACL action (permit or deny), source and destination MAC addresses, source and destination IP
addresses, and the source and destination ports (Layer 4 parameters) are also recorded.
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Access Control Lists (ACLs)