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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Common Configuration Errors

Common Configuration Errors

This section describes common faults caused by incorrect MSDP configurations and provides the troubleshooting procedure.

An MSDP Peer Is Always in Down State

Fault Description

An MSDP peer is configured, but is always in Down state.

Fault Analysis

MSDP sets up a TCP connection between a local interface address and a remote MSDP peer.

  • If the local interface address is different from the MSDP peer address configured on a remote device, the TCP connection cannot be set up.
  • If two MSDP peers have no route to each other, the TCP connection cannot be set up.

Procedure

  1. Check whether the two devices that will be configured as MSDP peers learn ARP entries from each other.

    Run the display arp command to check whether two devices learn ARP entries from each other.

  2. Check whether there is a reachable unicast route between two devices that will be configured as MSDP peers.

    Run the display ip routing-table command to check whether there is a unicast route between the local MSDP peer and the remote MSDP peer.

  3. Check that the interface address of the MSDP peers is correct.

    Run the display current-configuration command to check whether the local interface address is the same as the address of the MSDP peer.

There Is No (S, G) Entry in the SA Cache

Fault Description

MSDP fails to send (S, G) entries through SA messages.

Fault Analysis
  • The import-source command forwards (S, G) entries in a local domain to the remote MSDP peer through SA messages. If acl is not specified, the device filters all the (S, G) entries.
  • If the import-source command is not configured, the device sends all the (S, G) entries in the local domain. When MSDP fails to send (S, G) entries in the local domain through SA messages, check whether the import-source command is configured and correct.

Procedure

  1. Check whether the two devices that will be configured as MSDP peers learn ARP entries from each other.

    Run the display arp command to check whether two devices learn ARP entries from each other.

  2. Check whether there is a reachable unicast route between two devices that will be configured as MSDP peers.

    Run the display ip routing-table command to check whether there is a unicast route between the local MSDP peer and the remote MSDP peer.

  3. Check that the interface address of the MSDP peers is correct.

    Run the display current-configuration command to check whether the local interface address is the same as the address of the MSDP peer.

  4. Check whether the rule for filtering SA messages is configured.

    Run the display this command in the MSDP view to check whether import-source is configured with a specified acl, and the ACL rule is set to filter (S, G) information.

RPs Fail to Exchange Registration Information with Each Other

Fault Description

RPs in the anycast RP application fail to exchange (S, G) information registered to a local device with each other.

Fault Analysis

Pay attention to the following configuration notes. If the requirements are not met, the anycast RP works abnormally.

  • The address of an MSDP peer must be different from the address of the anycast RP. The C-BSR and C-RP must be configured on two devices or interfaces.
  • An MSDP peer performs the RPF check on a received SA message and then discards the message if the addresses of the local RP and the remote RP are the same. Run the originating-rp command on the anycast RP to replace the RP address contained in the SA message with the address of a specified interface.

Procedure

  1. Check whether the two devices that will be configured as MSDP peers learn ARP entries from each other.

    Run the display arp command to check whether two devices learn ARP entries from each other.

  2. Check whether there is a reachable unicast route between two devices that will be configured as MSDP peers.

    Run the display ip routing-table command to check whether there is a unicast route between the local MSDP peer and the remote MSDP peer.

  3. Check that the interface address of the MSDP peers is correct.

    Run the display current-configuration command to check whether the local interface address is the same as the address of the MSDP peer.

  4. Check whether the RP configuration is correct.

    In the anycast RP application, configure RPs with the same address on multiple switch moduleses in a PIM-SM domain. Generally, configure a loopback interface on each device and assign the same IP address to the loopback interfaces.

  5. Check whether the originating-rp command is configured.

    The originating-rp command must be configured on an anycast RP and the interface address specified by this command must be the same as the address of the local interface connected to the MSDP peer.

  6. Check the C-BSR address and the anycast RP address, and ensure that the two addresses are different.
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Updated: 2019-08-09

Document ID: EDOC1000041694

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