Route Redistribution

RRD (Route Redistribution) allows different routing protocols to exchange routing information.

RRD (Route Redistribution) allows different routing protocols to exchange routing information. Using a routing protocol to advertise routes that are learnt by other means, such as another routing protocol, static routes, or directly connected routes, is called redistribution. While running a single routing protocol throughout an entire IP internetwork is desirable, multi-protocol routing is widespread for a number of reasons (e.g. company mergers, multiple departments managed by multiple network administrators, and multi-vendor environments). If a single routing protocol cannot be used, RRD is the only solution. Running different routing protocols is often part of a network design.

Every routing protocol on a network is separated into an Autonomous System (AS). All routers in the same autonomous system (running the same routing protocol) have complete knowledge of the entire AS. A router that connects two (or more) autonomous systems is known as a Border Router (BR). A BR advertises routing information from one AS to the other ASs. It is not possible to redistribute routing information for different routing protocols. Different routing protocols have different and often incompatible algorithms and metrics.

To access Route Redistribution screens, go to Layer 3 Management > Redistribution.

Redistribution BGP Configuration

Figure 1. Redistribution BGP Configuration


Screen Objective This screen allows the user to configure redistribution of the routes that are learnt through other routing protocols to BGP.
Note:

To enable BGP functionality, enable BGP by going to

Layer 3 Management > BGP > BGP Creation
Navigation

Layer 3 Management > Redistribution > BGP
Fields
  • Select—click to select the BGP routes for which RRD status needs to be deleted.
  • BGP Status—select the route redistribution status for BGP. The default option is Disabled. The list contains:
    • Enabled—imports the specified routes into BGP and distributes the BGP learnt routes to IGP (Interior Gateway Protocol) (RIP and OSPF). Redistributes route information for both internal and external BGP..
    • Disabled—removes the specified routes from BGP and does not distribute or import routes from IGP (RIP and OSPF).
  • Import Routes—select Import Routes and control the redistribution of routes. The default option is Direct Route. The list contains:
    • Direct—enables import of directly connected routes into BGP.
    • Static—enables import of static routes into BGP.
    • RIP—enables import of RIP routes into BGP.
    • OSPF—enables import of OSPF routes into BGP.
    • ALL—enables import of all routes into BGP.
  • Route Map Name—enter the Routemap Name that identifies the specified route-map in the list of route-maps. This value is a string of maximum size 20.
  • Metric Value—enter the Metric Value that needs to be applied to the route before it is advertised into the BGP. This value is the domain Metric used for generating the default route. If the metric value is not specified, the default metric value considered as 1. The value used is specific to the protocol. This value ranges from 1 and 2147483647.
  • Match Type—select the metric type applied to the route before it is advertised into the OSPF domain. The options are:
    • External—redistributes OSPF external routes
    • Internal—redistributes OSPF internal routes
    • NSSA-External—redistributes OSPF NSSA external routes
    Note:

    This field is enabled only when the Import Routes are set as OSPF Routes.
Buttons
  • ADD—adds and saves new configuration.
  • Delete—deletes the selected entry.

Redistribution RIP Configuration

Figure 2. Redistribution RIP Configuration


Screen Objective This screen allows the user to configure redistribution of the routes that are learnt through other routing protocols to RIP.
Note:

To enable RRD RIP status, create VRF instance by using

Layer 3 Management > RIP > RIP VRF Creation
Navigation

Layer 3 Management > Redistribution > RIP
Fields
  • Select—click to select the RIP routes for which RRD status needs to be deleted.
  • RIP Status—select the route redistribution status for RIP. The default option is Disabled. The list contains:
    • Enabled—sets the route redistribution status as enabled. When enabled, it advertises the routes learned by other protocols and redistributes route information for both internal and external RIP.
    • Disabled—sets the route redistribution status as disabled and stops redistribution of routes but sends updates to the RTM.
  • Default Metric—enter the default metric for the imported routes. This value ranges from 0 to 16. The default value is 3.
  • Import Routes—select Import Routes to be imported to RIP. The default option is Direct. The list contains:
    • Direct routes—enables import of directly connected routes into RIP.
    • Static—enables import of static routes into RIP.
    • BGP—enables import of BGP routes into RIP.
    • OSPF routes—enables import of OSPF routes into RIP.
  • Route Tag Type—elect whether the tag is manually configured or automatically generated. The default option is Manual. The list contains:
    • Manual—generates the tags manually.
    • Automatic—generates the tag automatically.
  • Route Tag—enter the Route Tag if the Route Tag type is selected as Manual. This value ranges from 0 to 65535. The default value is 0.
  • Route Map Name—enter the name that identifies the specified route map in the list of route-maps. This value is a string of maximum size 20.
Buttons
  • ADD—adds and saves new configuration.
  • Delete—deletes the selected entry.

Redistribution OSPF Configuration

Figure 3. Redistribution OSPF Configuration


Screen Objective This screen allows the user to configure the redistribution of the routes that are learnt through other routing protocols to OSPF.
Note:

To enable RRD OSPF status, OSPF must be enabled using

Layer 3 Management > OSPF > OSPF VRF Creation
Navigation

Layer 3 Management > Route Map > Route Map Match
Fields
  • Select—click to select the RIP routes for which RRD status needs to be deleted.
  • OSPF Status—select the OSPF Status. The default option is Disabled. The list contains.
    • Enabled—sets the OSPF status as enabled. When enabled the advertises the routes learnt by other protocols.
    • Disabled—stops the redistribution of the routes but updates the Common Routing Table using the queue interface
  • Import Routes / Imported Route Type—select the source protocols from which routes are imported to OSPF. The default option is Direct routes. The list contains:
    • Direct routes—enables import of directly connected routes into OSPF.
    • Static routes—enables import of static routes into OSPF.
    • RIP routes—enables import of RIP routes into OSPF.
    • BGP—enables import of BGP routes into OSPF.
    • ALL—enables import of all routes into OSPF.
  • Route Map Name—enter the name that identifies the specified route-map in the list of route-maps. This value is a string of maximum size 20.
  • Metric Value—sets the Metric Type applied to the route before it is advertised into the OSPF Domain External link type associated with the default route advertised into the OSPF routing domain.
  • Metric Type—select the Metric type applied to the route before it is advertised into the OSPF domain. The default option is Type 2 External. The list contains:
    • Type 1 External—sets metric type as Type 1.
    • Type 2 External—sets metric type as Type 2.
Buttons
  • ADD—adds and saves new configuration.
  • Delete—deletes the selected entry.
Parent topic: Routing