Published On: August 6ᵗʰ, 2019 02:07

IP Routing: Protocol-Independent Configuration Guide, Cisco IOS XE Release 3S

The SGT Based PBR feature supports classification of packets based on Security Group for grouping the traffic into roles to match the defined policies in Policy-Based Routing (PBR).

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Restrictions for SGT Based PBR

  • SGT Based PBR feature supports policy configuration using number based tagging and does not support name based tagging.

  • SGT Based PBR feature is not supported for IPV6 traffic on IOS XE.

  • Dynamic route-map overrides static route-map when both are associated with the same interface. A warning message is issued during an override. The static route-map is enabled when the dynamic route-map is deleted.

  • We recommend disassociating the route-map before it is deleted. You cannot configure static PBR if the route-map is deleted before disassociating it from the interface.

Information About SGT Based PBR

Cisco TrustSec

Cisco TrustSec assigns a Security Group Tag, (SGT) to the user’s or device’s traffic at ingress and applies the access policy based on the assigned tag. SGT Based PBR feature allows you to configure PBR based on Security Group classification enabling you to group users or devices into a role to match the defined policies.

SGT Based PBR

Security Group classification includes both Source and Destination Group, which is specified by source SGT and DGT. SGT Based PBR feature provides the PBR route-map match clause for SGT/DGT based packet classification. SGT Based PBR feature supports configuration of unlimited number of tags, but it is recommended to configure the tags based on memory available in the platform. SGT Based PBR supports VPN routing and forwarding (VRF) selection match criteria which can be used for policy based classification and forwarding of Virtual Private Network (VPN) traffic.

How to Configure SGT Based PBR

Configuring Match Security Group Tag

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. route-map map-tag
  4. match security-group source tag sgt-number
  5. set ip next-hop ip-address
  6. match security-group destination tag sgt-number
  7. set ip next-hop ip-address
  8. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

route-map map-tag

Example:

Device(config)# route-map policy_security

Specifies the route-map and enters route-map configuration mode.

Step 4

match security-group source tag sgt-number

Example:

Device(config-route-map)# match security-group source tag 100

Configures the value for security-group source security tag.

Step 5

set ip next-hop ip-address

Example:

Device(config-route-map)# set ip next-hop 71.71.71.6

Specifies the next hop for routing packets.

Step 6

match security-group destination tag sgt-number

Example:

Device(config-route-map)# match security-group destination tag 150

Configures the value for security-group destination security tag.

Step 7

set ip next-hop ip-address

Example:

Device(config-route-map)# set ip next-hop 72.72.72.6

Specifies the next hop for routing packets.

Step 8

end

Example:

Device(config-route-map)# end

Exits route-map configuration mode and returns to privileged EXEC mode.

Assigning Route-Map to an Interface

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface type slot / subslot / port [. subinterface-number ]
  4. ip policy route-map map-tag

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

interface type slot / subslot / port [. subinterface-number ]

Example:

Device(config)#interface gigabitEthernet0/0/0

Specifies the interface information and enters interface configuration mode.

Step 4

ip policy route-map map-tag

Example:

Device(config-if)#ip policy route-map policy_security

Assigns the route-map configured in the previous task to the interface.

Displaying and Verifying SGT Based PBR Configuration

SUMMARY STEPS

  1. enable
  2. show ip policy
  3. show route-map map-tag
  4. show route-map dynamic

DETAILED STEPS

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

show ip policy

Example:

Device# show ip policy

Interface      Route map
Gi0/0/1.77     test

Displays IP policy information.

Step 3

show route-map map-tag

Example:

Device# show route-map test

route-map test, permit, sequence 10
  Match clauses:
    security-group source tag 100 111
  Set clauses:
    ip next-hop 71.71.71.6
  Policy routing matches: 0 packets, 0 bytes
route-map test, permit, sequence 20
  Match clauses:
    security-group destination tag 200 222
  Set clauses:
    ip next-hop 72.72.72.6
  Policy routing matches: 0 packets, 0 bytes

Displays route-map configuration.

Step 4

show route-map dynamic

Example:

Device# show route-map dynamic

route-map AAA-02/11/15-12:32:52.955-1-test, permit, sequence 0, identifier 2818572289
Match clauses:
    Security-group source tag 100 300
Set clauses:
 ip next-hop 3.3.3.2
Nexthop tracking current: 3.3.3.2
3.3.3.2, fib_nh:7FDE41661370,oce:7FDE4C540AD0,status:1

 Policy routing matches: 1012 packets, 83458 bytes
Current active dynamic routemaps = 1

Displays information about dynamic PBR route-map.


Configuration Examples for SGT Based PBR

Example: SGT Based PBR

Example: SGT Based PBR

The following example shows how to configure SGT Based PBR:

enable
 configure terminal
 route-map policy_security
 match security-group source tag 100
 match security-group source tag 111
 set ip next-hop 71.71.71.6
 match security-group destination tag 200
 match security-group destination tag 222
 set ip next-hop 72.72.72.6
 end
 interface gigabitEthernet0/0/0
 ip policy route-map policy_security

Additional References for SGT Based PBR

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

Cisco IOS IP Routing Protocol Independent commands

Cisco IOS IP Routing Protocol Independent Command Reference

Cisco TrustSec Overview

Understanding Cisco TrustSec

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Feature Information for SGT Based PBR

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 1. Feature Information for SGT Based PBR

Feature Name

Releases

Feature Information

SGT Based PBR

This feature is supported on Cisco 4000 Series ISRs.

SGT Based PBR

Cisco IOS XE Release 3.16S

The SGT Based PBR feature supports classification of packets based on Security Group Tag (SGT) for grouping the traffic into roles to match the defined policies in PBR.

The following commands were introduced or modified: interface , ip policy route-map , match security-group destination tag , match security-group source tag , route-map , show ip policy , show route-map , show route-map dynamic , show platform hardware qfp active classification class-group-manager class-group client pbr , show platform hardware qfp active classification feature-manager class-group tcam pbr global details , match security-group source tag , show platform hardware qfp active feature pbr class-group , show platform software pbr fp interface all, show platform software pbr rp ac statistics , show platform software route-map fp active map , show platform software route-map rp active map .