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C H A P T E R  17
Feedback RRD

RRD allows the exchange of routing information between different routing protocols running on the same router. It enables a routing protocol to advertise routes that are learned by other means, such as another routing protocol, static configuration, or direct connection. While running a single routing protocol throughout an entire IP internetwork may be desirable, multi-protocol routing is widespread for a number of reasons. For example, company mergers, multiple departments managed by different network administrators, and multi-vendor environments create situations where a single routing protocol cannot be used. Running different routing protocols is also often part of a network design. In any case, having a multi protocol environment makes redistribution a necessity.

When multiple routing protocols are used, routers in the same autonomous system (AS) run the same protocol to compute routes within the autonomous system. A router that connects two or more autonomous systems is known as a border router. A border router advertises routing information from one AS to other AS(s). Different routing protocols use different and sometimes incompatible algorithms and metrics. It is only possible to redistribute routing information for compatible metrics.

17.1 RRD Commands

The list of CLI commands for the configuration of RRD is as follows:

17.1.1 as-num

Sets the AS number for the router. 


as-num 1-65535


Mode

Global Configuration

Default

0

Example

SEFOS(config)# as-num 5

Notes

The RRD Module must be enabled before any routing protocol module is configured.


Related Commands

17.1.2 router-id

Sets the router identifier’s address for the router. 


router-id addr


Mode

Global Configuration

Example

SEFOS(config)# router-id 12.0.0.1

Notes

The router-id must be one of the IP addresses of the IP interfaces configured in the switch.


Related Commands

17.1.3 export ospf

Enables redistribution of OSPF area or external routes to the protocol. The no form of the command disables redistribution of OSPF area or external routes to the protocol. 


export ospf {area-route | external-route} {rip}



no export ospf {area-route | external-route} {rip}


Mode

Global Configuration

Example

SEFOS(config)# export ospf area-route rip


Related Commands

17.1.4 redistribute-policy

Adds the permit or deny redistribution policy. The no form of the command removes the permit or deny redistribution policy. 


redistribute-policy {permit|deny} dest-ip dest-range {connected | static | rip | ospf} {rip | ospf | all}



no redistribute-policy dest-ip dest-range


Syntax Description

permit - Sets the default rule for all prefixes to permit.

deny - Sets the default rule for all prefixes to deny.

dest-ip - Destination IP address.

dest-range - Destination range.

connected - Connected routes.

static - Static routes.

rip - Routing information protocol.

ospf - Open shortest path first.

all - All.

Mode

Global Configuration

Default

Permit all.

Example

SEFOS(config)# redistribute-policy permit 10.0.0.0 0.0.0.255 connected ospf

Notes

The addresses learnt within the specified range through the specified routing protocol will be redistributed to other routing protocols, if permit is used and will not be redistributed to other routing protocols, if deny is used.


Related Commands

17.1.5 default redistribute-policy

Sets the default behavior of RRD control table. 


default redistribute-policy {permit | deny}


Syntax Description

permit - Sets the default rule for all prefixes to permit

deny - Sets the default rule for all prefixes to deny

Mode

Global Configuration

Example

SEFOS(config)# default redistribute-policy permit


Related Commands

17.1.6 show ip protocols

Displays information about the active routing protocol process. 


show ip protocols


Mode

Privileged EXEC

Example

SEFOS# show ip protocols

 

Routing Protocol is rip

RIP2 security level is Maximum

Redistributing : rip

Output Delay is disabled

Retransmission timeout interval is 5 seconds

Number of retransmission retries is 36

Default metric is 3

Auto-Summarisation of routes is enabled

Routing for Networks :

10.0.0.0

30.2.0.0

Routing Information Sources :

Interface Specifi Address Summarisation :

Interface vlan1

Sending updates every 30 seconds

Invalid after 180 seconds

Flushed after 120 seconds

Send version is 1 2, receive version is 1 2

Authentication type is none

Split Horizon with poissoned reverse is enabled

Installs default route received

Originate default route

Interface vlan2

Sending updates every 30 seconds

Invalid after 180 seconds

Flushed after 120 seconds

Send version is 2, receive version is 2

Authentication type is none

Split Horizon with poissoned reverse is enabled

 

Restrcts default route installation

Restricts default route origination

 

Routing Protocol is "ospf" Router ID 0.0.0.0

 

Number of areas in this router is 0 . 0 normal 0 stub 0 nssa

Routing for Networks:

Passive Interface(s):

Routing Information Sources:

 

 

Gateway Distance Last Update(secs)

Distance: (default is 121)

 

Routing Protocol is "bgp 0"

Outgoing update filter list for all interfaces is not set

Incoming update filter list for all interfaces is not set

IGP synchronization is disabled

 

Neighbor(s):

Address

 

Routing Information sources:

Gateway Last Update

Notes

The information displayed by this command is useful in debugging routing operations.


Related Commands

17.1.7 show redistribute-policy

Displays route redistribution filters. 


show redistibute-policy


Mode

Privileged EXEC

Example

SEFOS# show redistribute-policy

 

Destination Range SrcProto DestProto Flag

----------- ----- -------- ----------- ---

0.0.0.0 255.255.255.255 none others Deny

10.0.0.0 255.0.0.0 rip all Allow


Related Commands

17.1.8 show redistribute information

Displays RTM RRD status for registered protocols. 


show redistribute information


Mode

Privileged EXEC

Example

SEFOS# show redistribute information

 

Router ID is 0.0.0.0

AS Number is 0

Current State is disabled

 

ProtoName OspfAreaRoutes OspfExtRoutes

--------- -------------- -------------

other Disable Disable

local Disable Disable

static Disable Disable

rip Disable Disable

bgp Disable Disable


Related Commands

 

Feedback


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