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Static routes

USER GUIDE

148

show ip route tag N

show ip route cache

SET MARK COMMAND

The command set mark allows to mark the packets, which is useful for the Policy Base Routing

operation described in the following paragraph. This command allows you to classify the traffic

based on any combination of the header fields that form the package and to apply a value to the

mark. Keep in mind that this marking is not performed on the packet sent in the network, but it is

applied on a descriptor inside the package itself.

The possible combinations are:

set mark VALUE protocol PROT from ADDRESS to ADDRESS out-interface INTF in-interface INTF

set mark VALUE protocol PROT from ADDRESS source-port PORT to ADDRESS dest-port PORT out-interface INTF in-interface INTF

where:

 VALUE is the numerical value of the mark

 PROTOCOL is the protocol type, that can be:

 TCP

 UDP

 ICMP

 GRE

 OSPF

 L2TPV3

 any

 ADDRESS can be a network prefix (10.10.10.0/24) or the keyword any (that mean any

address) or the keyword this (that mean any address of the router itself)

 PORT is a numeric number that identify UDP or TCP ports, or a string that tells the service

(Telnet, SSH, SNMP,...) or the keyword any.

POLICY BASE ROUTING

Unlike the classical routing, which allows you to make decisions based on the IP destination, the

Routing Policy allows you to select the routing based on the destination as well as on other

parameters such as the source IP address, the protocol type, the source or destination, the TOS or

any combination of the fields of the IP packet.

This mechanism is obtained combining properly the following commands:

 set route defines multiple routing tables. It always exists a default routing table (called

main table); the other ones are created by specifying the table option, which can have value

starting from 1 to 4.

 set policy-routing establishes the criteria for consultation of the routing tables

 set mark is used to mark the packets.

Every routing criteria is described in a separate routing table. To be more clear, let's have a look to

some examples.

Tiesse Imola LX 5200 User Manual

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