Chapter 16: Dynamic Routing Protocols
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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The ACL counter will be incremented when the packet matches the ACL specification. This ACL check is done before the
PBR set action is evaluated.
A PBR match occurs and the PBR match count is incremented when a packet arrives at a PBR-enabled interface and all
of the set commands of the route map work.
Packets that match at least one match statement, but then had one or more set statements fail are counted by the PBR
failed counter. In practice this means that either the set next-hop or set backup-next-hop failed.
Match Statements
The following guidelines should be observed when creating match statements:
This implementation of PBR can use standard access control lists to match source IP addresses or extended ACLs to
specify match criteria for source and destination IP, application, protocol type, or ToS.
In any one sequence number (map entry) only one ACL can be specified for the match IP address command. However,
multiple match IP address ACLs can be concatenated into the one ACL specified by the sequence number.
If the route map is applied to a packet and no match is found, the packet is not dropped; instead, it is forwarded using
destination-based routing.
If a route map is created with no match criteria, then it will be applied to all packets that come in to the specified
interface. All set operations will be performed on all packets (unless the set fails).
Only one match statement is allowed for each sequence number. When a packet matches the match statement with
the lowest sequence number, only the corresponding set statements in that route-map will be processed. If the set
statements fail, then the packet will fall back to normal destination-based routing. The packet will not be checked for
additional matches.
Set IP ToS
The
configure route-map-policy * permit * set ip tos
command is used to set the 5 ToS bits; values 0, 1, 2, 4, and 8
are used (one of the bits is reserved).
Table 70.
Setting ToS Values
ToS Value | name
Description
0 | normal
Sets the normal ToS