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CCNP Service Provider lab 4 of 23

Route policy language and route maps

Filter and tag exchange routes with a route map on IOS and route policy language on IOS XR, then redistribute both ways between IS-IS and BGP without a loop.

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It needs Lite: its 4 nodes are set to 4 vCPU and 6,144 MB in total. That fits the free demo too.

In your workspace: Shared, then CCNP Service Provider guided labs, then 04 - Route policy language and route maps

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Level
Intermediate
Time
About 75 minutes
Nodes need
4 vCPU, 6,144 MB
Smallest plan
Lite

The scenario

Fellgate Carrier's edge router R1 peers with an exchange, EXT (AS 64510). R2 connects LEG, a router Fellgate took over from Hollins Cable. LEG runs IS-IS and has never heard of BGP, and that won't change until it's replaced next year.

Three things have to happen:

  • R1 takes only the two approved prefixes from the exchange, and tags them.
  • R2 passes those prefixes into IS-IS, so LEG can reach the exchange.
  • R2 passes LEG's office LAN into BGP, and nothing comes back round in a loop.

IS-IS and iBGP between R1 and R2 are running. The eBGP session to EXT is up, with no policy on it yet.

DeviceInterfaceAddressConnects to
EXTLoopback1203.0.113.1/24
EXTLoopback2198.51.100.1/24
EXTLoopback3192.0.2.129/25
EXTGi0/0172.16.1.2/30R1 Gi0/0/0/2
R1Loopback010.255.0.1/32
R1Gi0/0/0/010.0.12.1/30R2 Gi0/0/0/0
R1Gi0/0/0/2172.16.1.1/30EXT Gi0/0
R2Loopback010.255.0.2/32
R2Gi0/0/0/010.0.12.2/30R1 Gi0/0/0/0
R2Gi0/0/0/110.0.29.1/30LEG Gi0/0
LEGLoopback1192.168.9.1/24
LEGLoopback010.255.0.9/32
LEGGi0/010.0.29.2/30R2 Gi0/0/0/1

What you’ll practise

  • Show that eBGP on IOS XR needs a route policy in both directions
  • Write a route map with match and set clauses
  • Build RPL with prefix, community and AS-path sets, parameters and apply
  • Redistribute between IS-IS and BGP with tags
  • Prove the policy with show commands and end-to-end traffic

The tasks

  1. See XR's default for eBGP
  2. A route map on IOS
  3. Route policy language on XR
  4. Redistribute with tags
  5. Prove it end to end

The Lab Tasks pane has the scenario, these tasks, the checks to run, hints and the full solution.

Topology and devices

The network as it opens in EVE-NG, drawn from the lab’s own canvas, and the image each node runs.

Topology of Route policy language and route maps4 nodes, 3 links. Every link is listed as text below the diagram.EXTR1R2LEGGi0/0Gi0/0/0/2Gi0/0/0/0Gi0/0/0/0Gi0/0/0/1Gi0/0
4 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • EXT Gi0/0 to R1 Gi0/0/0/2
  • R1 Gi0/0/0/0 to R2 Gi0/0/0/0
  • R2 Gi0/0/0/1 to LEG Gi0/0
Nodes in Route policy language and route maps, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
EXTCisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
R1Cisco IOS XRvxrv-k9-demo-6.3.11 vCPU, 2,560 MB
R2Cisco IOS XRvxrv-k9-demo-6.3.11 vCPU, 2,560 MB
LEGCisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB

How to open this lab

  1. Sign in to your workspace at lab.cloudlabbox.com.

  2. In File Manager, open Shared, then the folder CCNP Service Provider guided labs.

  3. Open 04 - Route policy language and route maps and start its nodes, then open Lab Tasks for the scenario and the steps.

The lab is read-only. You can start the nodes and configure the devices, but changes to the topology can’t be saved. To change it, rebuild it in your own folder.

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CloudLabBox is independent of Cisco. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.