Redirect Policies. Web Redirection Captive Portal. ISID Filters. VID Filters. Configuration Notes. ACL Filter policies, also referred to as Access Control Lists ACLs or filter for short, are sets of ordered rules specifying packet match criteria and actions to be performed upon a match. Filters are applied to services or network ports to control network traffic into ingress or out of egress a service access port SAP or network.
The same filter can be applied to ingress traffic, egress traffic, or both. Ingress filters affect only inbound traffic destined for the routing complex, and egress filters affect only outbound traffic sent from the routing complex. Configuring an entity with a filter policy is optional. By default, there are no filters associated with services or interfaces, and therefore, all traffic is allowed on the ingress and egress interfaces. The filter must be explicitly created and associated.
There are different types of filter policies as defined by the scope argument of the filter policy.
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Filter policies are created with a unique filter ID, but each filter has also a unique filter name argument that can be defined once the filter policy has been created. Either filter ID or filter name can then be used throughout the system to manage filter policies and their associations. The ingress and egress direction policies can be same or different. Note that non-IP packets are not hitting an IP filter policy, so the default action in the IP filter policy will not apply to these packets.
A filter policy is applied to packets coming through the system, in the ascending order the entries are numbered in the policy. If a packet does not match the entry parameters, the packet is compared to the next higher numerical filter entry, and so on.
If the packet does not match any of the entries, the system executes the default action specified in the filter policy. Each filter policy is assigned a unique filter ID. Each filter policy is defined with:. In addition, in a filter policy entry, an operator can also:. Filter policies can be associated with the following entities:. Security CPM filter.
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Router interface. Egress multicast group. Pseudowire template. Release 11R4 introduces an enhanced flexibility in defining per service or per customer filter policies across services and interfaces that the router supports. Prior to release All policies would be downloaded to all line cards, regardless whether a policy was needed by a line card or not.
Starting with Release The operator can manage the standard filter policies at a system-level with system-wide policy identifiers and SR-OS automatically maps and downloads policies to each FlexPath only as needed by services and interfaces configured on that FlexPath. Statistics for filters aggregate all statistics across all FlexPaths that have a given filter entry active and will show zero 0 if a filter entry is not downloaded to any line card.
Setting Up a MAC Filter: 5 Steps
The statistics are also reset to zero 0 when a given filter is removed from one of the line cards. When a filter is downloaded to a new line card as result of another service using that filter, the statistics continue incrementing. If a maximum supported on a given FlexPath is breached, the configuration change to a filter policy is blocked. Due to a co-existence of dynamic filter policy entries in the system, an operator-configured filter policy may still fail to be installed in hardware later on.
If that is the case, a trap will be raised for the impacted filter policies. It is recommended that the operator remove extra filter entries as operational conditions, such as an IOM reset for example may cause different filter entries to be activated when FlexPath limits are exceeded. Since only the active filter policies are downloaded to a given line card, counters for filter entries are available only for those filters that are downloaded to one or more line cards.
An operator has to create one entry for each address prefix to execute a common action. Each entry defines a match on a unique address prefix from the list plus any other additional match criteria and the common action. If the same set of address prefixes needs to be used in another IOM or CPM filter policy, an operator again needs to create one entry for each address prefix of the list in those filter policies. Same procedure applies not shown above if another action needs to be performed on the list of the addresses within the same filter policy when for example specifying different additional match criteria.
Instead of defining multiple filter entries in any given filter, an operator can now group same type of the matching criteria into a single filter match list, and then use that list as a match criterion value, thus requiring only single filter policy entry per each unique action. The match lists further simplify management and deployment of the policy changes. A change in a match-list content is automatically propagated across all policies employing that list in their match criteria, thus only a single configuration change is required to trigger policy changes when a list is used by multiple entries in one or more filter policies.
Note: The hardware resource usage does not change whether filter match lists are used or whether operator creates multiple entries each per one element of the list : however, a careful consideration must be given to how the lists are used to ensure only desired match permutations are created in a filter policy entry especially when other matching criteria that are also lists or ranges are specified in the same entry.
The system verifies that a new list element, for example, an IP address prefix, cannot be added to a given list or a list cannot be used by a new filter policy unless resources exist in hardware to implement the required filter policy ies that reference that list. If that is not the case, addition of a new element to the list or use of the list by another policy will fail. Some use cases like those driven by dynamic policy changes, may result in acceptance of filter policy configuration changes that cannot be programmed in hardware because of the resource exhaustion.
If that is the case, when attempting to program a filter entry that uses a match list s , the operation will fail, the entry will be not programmed, and a notification of that failure will be provided to an operator.
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It is often desired to automatically update a filter policy when the configuration on a router changes. To allow such a touch-less filter policy management, SROS allows auto-generation of address prefixes for IPv4 or IPv6 address prefix match lists based on operator-configured criteria. When the configuration on a router changes, the match lists address prefixes are automatically updated and, in-turn, all filter policies CPM or IOM that use these match lists are automatically updated. When using auto-generation of address prefixes inside an address prefix match list operators can:.
Specify one or more regex expression matches against SROS router configuration per list. Mix auto-generated entries with statically configured entries within a match list. The following additional rules apply to auto-generated entries:. Operational and administrative states of a given router configuration are ignored when auto-generating address prefixes.
Duplicates are not removed when populated by different auto-generation matches and static configuration. A configuration will fail if auto-generation of address prefix would result in filer policy resource exhaustion on a filter entry, system, or line-card level. If filter policy resources are not available for newly auto-generated address prefixes when a BGP configuration changes, new address-prefixes will not be added to impacted match lists or filter policies as applicable.
An operator must free resources and change filter policy configuration or must change BGP configuration to recover from this failure. To simplify management of such common rules across multiple filter policies, operator can now use embedded filter policies. An embedded filter policy is a special type of a filter policy that cannot be deployed directly but instead is used to define a common filter policy rules that are then included in embedded by other filter policies in the system.
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Thanks to embedding, a common set of rules can now be defined and changed in a single place but deployed across multiple filter policies. The following main rules apply when embedding an embedded filter policy:.
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When embedding an embedded filter, an operator may wish to change or deactivate an embedded filter policy entry in one of the embedding filter, thus allowing for customizing of the common embedded filter policy rules by the embedding filter. This can be achieved by either defining an entry in the embedding filter that will match ahead of the embedded filter entry or by overwriting the embedded filter entry in the embedding filter.
Any embedded policy rule edits are automatically applied to all filter policies that embed that embedded filter policy. If resources are not available, the configuration is rejected. In rare cases, filter policy resource check may pass but filter policy can still fail to load due to a resource exhaustion on a line card for example when other filter policy entries are dynamically configured by applications like RADIUS in parallel. If that is the case, the embedded filter policy configured will be de-activated configuration will be changed from activate to inactivate.
Although a partial embedding into a single filter will not take place, an embedded filter may be embedded only in a subset of embedding filters only those where there are sufficient resources available. SROS-based routers support redirect policies. Redirection policies are used to identify cache servers or other redirection target destinations and define health check test methods used to validate the ability for the destination to receive redirected traffic.
This destination monitoring greatly diminishes the likelihood of a destination receiving packets it cannot process. Redirection identifies packets to be redirected and specifies the method to reach the web cache server. Packets are identified by IPv4 filter entries. The redirection action is accomplished and supported with Policy Based Routing. Only IPv4 routed frames can be redirected.
Bridged IP packets that match the entry criteria will not be redirected. Redirection policies can contain multiple destinations. Each destination is assigned an initial or base priority describing its relative importance within the policy. The destination with the highest priority value is selected. There are no default redirect policies. Each redirect policy must be explicitly configured and specified in an IPv4 filter entry. To facilitate redirection based on a redirection policy, an IPv4 filter must be created and applied to the appropriate ingress IP interfaces where redirection is required.
The entry criteria for the filter entry must specify a redirect policy to enable the appropriate IPv4 packets to be redirected from the normal IPv4 routing next hop. If packets do not meet any of the defined match criteria, then those packets are routed normally through the destination-based routing process. The redirection policy is referenced within the action context for an IPv4 filter entry, binding the filter entry to the policy and the IPv4 destinations managed by the policy.