• Author : Ethan Vadai

 
 

Policy-based Routing

Description Policy-based routing (PBR) is a feature that is applied on routable ports, to preferentially route packets. Forwarding is based on a policy that is enforced at the ingress of the applied interface and overrides normal routing decisions. In addition to matches on regular ACLs, PBR policy-maps can also include “raw match” statements that look like a single entry of an ACL as a convenience for users. The action parts of a PBR policy typically sets a next-hop for packets that match rules in the policy. The action is specified per class, or per rule for a raw match statement....
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ACL Counters per Chip

Description ACL counters can be displayed on a per chip basis by passing an additional option in the ACL show command. The output of the new command contains the chip name, followed by all of the ACL rules. Each rule will have a count next to it (if non-zero), indicating the number of times the rule was hit on that particular chip. The chips listed in the output are all of the chips on which the ACL is configured. Platform compatibility All 7500, 7280, 7020 Configuration ACL counters per chip are turned on as long as the ACL meets the...
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ACL Config-Session Rollback

Description A common way of configuring a switch is with config-session or with config-replace. In a config-session, if the configuration being applied contains direct ACL modification (adding or removing rules) or ACL application (applying an ACL to an interface), there is a chance that hardware resources may not be sufficient for the new ACL configuration and the ACL fails to program. In such a situation, the configuration is rolled back to the previous configuration that was present before the configuration session began. Platform compatibility All 7500, 7280, 7020 Configuration No special configuration is necessary for ACL config-session rollback to work....
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