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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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Device Does not Send Some or All Routes

Device Does not Send Some or All Routes

Common Causes

This fault is commonly caused by one of the following:

  • The outgoing interface is not enabled with RIP.

  • The outgoing interface is not in the Up state.

  • The silent-interface command is configured on the outgoing interface so that the interface is suppressed from sending RIP packets.

  • The undo rip output command is configured on the outgoing interface so that the interface is disabled to send the RIP packet.

  • The RIP split-horizon is disabled on the outgoing interface.

  • The policy for filtering imported RIP routes is configured in RIP.

  • The physical status of the interface is Down or Administratively Down, or the current status of the protocol on the outgoing interface is Down. The IP address of the interface cannot be added to the advertised routing table for RIP.

  • Although the outgoing interface does not support the multicast or broadcast mode, packets must be sent to a multicast or broadcast address.

  • The MTU value of the outgoing interface is less than 52.

Troubleshooting Flowchart

If a router sends partial or none routes, refer to the following troubleshooting flowchart, as shown in Figure 19-2.

Figure 19-2  RIP route sending troubleshooting flowchart

Troubleshooting Procedure

Context

NOTE:

Saving the results of each troubleshooting step is recommended. If you are unable to correct the fault, you will have a record of your actions to provide technical support personnel.

Procedure

  1. Check whether the outgoing interface is enabled with RIP.

    The network command is used to specify an interface network segment. Only an interface enabled with RIP can receive and send RIP routes.

    Run the display current-configuration configuration rip command to check information about a network segment where RIP is enabled. Check whether the outgoing interface is enabled.

    The network address enabled by using the network command must be that of the natural network segment.

  2. Check whether the outgoing interface works normally.

    Run the display interface command to check the operating status of the outgoing interface.

    If the physical status of the interface is Down or Administratively Down, or the status of the current protocol is Down, RIP cannot work properly on the interface.

    Ensure that the interface is normal.

  3. Check whether the silent-interface command is configured on the outgoing interface.

    The silent-interface command is used to suppress the interface from sending the RIP packet.

    The display current-configuration configuration rip command is used to check whether the interface is suppressed from sending RIP packets.

    If the silent-interface command is configured, disable suppression on the interface.

  4. Check whether the undo rip output command is configured on the outgoing interface.

    Run the display current-configuration command on the outgoing interface to view whether the rip output command is configured.

    The rip output command enables the interface to send RIP packets.

    The undo rip output command disables the interface from sending RIP packets.

    If the undo rip output command is configured on the outgoing interface, the RIP packet cannot be sent on the interface.

  5. Check whether the rip split-horizon command is configured on the outgoing interface.

    Run the display current-configuration command on the outgoing interface to view whether the rip split-horizon command is configured. If the command is configured, split-horizon is enabled on the outgoing interface.

    By default, split-horizon is enabled on all outgoing interfaces, and the output of the command does not contain configuration items about split-horizon.

    For the outgoing interface (such as X.25, FR) on the NonBroadcast Multiple Access (NBMA) network, if the display does not contain a configuration item about split-horizon, it indicates split-horizon is not enabled on the outgoing interface.

    Split-horizon means that the route learned from an interface is not advertised on the interface.

    Split-horizon is used to prevent a loop between adjacent neighbors from forming.

  6. Check whether the policy filtering the imported RIP route is configured in RIP.

    Run the filter-policy export command to configure the filtering policy on the global interface.

    Only routes that pass the filtering policy can be added to the advertised routing table of RIP. These routes are advertised through the updated packet.

  7. Check the status of the interface when the route is sent to the local interface address.

    Run the display interface command to check the operating status of the interface.

    If the physical status of the interface is Down or Administratively Down, or the current status of the protocol on the outgoing interface is Down, the IP address of the interface cannot be added to the advertised routing table of RIP. Therefore, the routing information is not sent to the neighbor.

  8. Check whether there are other problems.

    If the outgoing interface does not support multicast or broadcast mode and a packet needs to be sent to a multicast or broadcast address, this fault will occur.

    This potential source of the fault can be removed by configuring the peer command in the RIP mode to make routers send packets with unicast addresses.

  9. If the fault persists, contact technical support personnel and provide them with the following information.

    • Results of the preceding troubleshooting procedure
    • Configuration files, log files, and alarm files of the devices

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Updated: 2019-05-10

Document ID: EDOC1000079719

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