Administrator Guide

• Dell EMC Networking OS supports multiple next-hop entries in the redirect lists.
• Redirect-lists are applied at Ingress.
PBR with Redirect-to-Tunnel Option:
You can provide a tunnel ID for a redirect rule. In this case, the resolved next hop is the tunnel interface IP. The qualifiers of the rule
pertain to the inner IP details. You must provide a tunnel ID for the next hop to be a tunnel interface. If you do not provide the tunnel
destination IP as the next hop, the next hop is treated as an IPv4 next hop and not a tunnel next hop.
PBR with Multiple Tracking Option:
PBR with the multiple tracking option enabled extends and introduces the capabilities of object tracking to verify the next hop IP address
before forwarding the traffic to the next hop. The multiple tracking options feature is most suitable for routers which have multiple
devices as the next hop (primarily indirect next-hops and/or Tunnel Interfaces). These options allow you to backup Indirect next-hop with
another. Choose the specific Indirect next-hop and/or Tunnel interface which is available by sending ICMP pings to verify the reach ability
and/or check the Tunnel interface UP or DOWN status, and then route traffic out to that next-hop and/or Tunnel Interface
Implementing PBR
• Non-contiguous bitmasks for PBR
• Hot-Lock PBR
Non-Contiguous Bitmasks for PBR
Non-contiguous bitmasks for PBR allows more granular and flexible control over routing policies. You can include or exclude network
addresses that are in the middle of a subnet can be included or excluded. Enter specific bitmasks using the dotted decimal format.
DellEMC#show ip redirect-list
IP redirect-list rcl0:
Defined as:
seq 5 permit ip 2.2.2.2 255.255.0.0 any
seq 10 redirect 1.1.1.2 tcp 3.3.3.3 255.255.255.0
seq 40 ack, Next-hop reachable(via Te 8/1)
Applied interfaces:
Te 8/2
Hot-Lock PBR
Ingress and egress Hot lock PBR allows you to add or delete new rules into an existing policy (already written into content address
memory [CAM]) without disruption to traffic flow. Existing entries in content addressable memory (CAM) are adjusted to accommodate
the new entries. Hot Lock PBR is enabled by default.
Configuration Task List for Policy-based Routing
This section explains how to configure PBR on the system.
• Create a Redirect List
• Create a Rule for a Redirect-list
• Create a Track-ID list
• Apply a Redirect-list to an Interface using a Redirect-group
PBR Exceptions (Permit)
To create an exception to a redirect list, use thepermit command. Exceptions are used when a forwarding decision should be based on
the routing table rather than a routing policy.
The Dell EMC Networking OS assigns the first available sequence number to a rule configured without a sequence number and inserts the
rule into the PBR CAM region next to the existing entries. Because the order of rules is important, ensure that you configure any
necessary sequence numbers.
Never apply the permit statement because the redirect list covers all source and destination IP addresses.
ip redirect-list rcl0
seq 5 redirect 2.2.2.2 ip any any
seq 10 permit ip host 3.3.3.3 any
640
Policy-based Routing (PBR)