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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R011C10

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, OSPFv3, IS-IS(IPv4), IS-IS(IPv6), BGP, Routing Policy ,and PBR, and provides configuration examples.
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(Optional) Configuring BFD on an Interface

(Optional) Configuring BFD on an Interface

Context

To allow the switch to rapidly detect interface failures, configure BFD for OSPF on the interface. The switch then instructs OSPF to recalculate routes, speeding up OSPF convergence. If the OSPF neighbor relationship established using this interface goes Down, the BFD session between the OSPF neighbors is dynamically deleted.

Before configuring BFD for OSPF on an interface, enable BFD globally.

Perform the following steps on the switch:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. (Optional) On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

  4. Run ospf bfd enable

    BFD is enabled on the interface, and a BFD session is established.

    If all the interfaces in a single process are configured with BFD and their neighbor relationships are in the Full state, OSPF creates BFD sessions with default parameter values on the interfaces in the process.
    NOTE:
    The priority of BFD for OSPF configured on an interface is higher than that of BFD for OSPF configured for a process.

    If parameters need to be set for BFD sessions, run the ospf bfd { min-rx-interval receive-interval | min-tx-interval transmit- interval | detect-multiplier multiplier-value } * command.

    Using the default receive-interval, transmit-interval, and multiplier-value values is recommended. Therefore, the ospf bfd { min-rx-interval receive-interval | min-tx-interval transmit- interval | detect-multiplier multiplier-value } * command can be skipped.

    The parameters are configured based on the network status and network reliability requirements. A short interval between BFD packet transmission can be configured if high network reliability is required.

    NOTE:
    • Actual interval between BFD packet transmission on the local switch = Max { configured interval transmit-interval between BFD packet transmission on the local switch, configured interval receive-interval between BFD packet receipt on the peer switch }
    • Actual interval between BFD packet receipt on the local switch = Max { configured interval transmit-interval between BFD packet transmission on the peer switch, configured interval receive-interval between BFD packet receipt on the local switch }
    • Actual time for detecting BFD packets = Actual interval between BFD packet receipt on the local switch x Configured detection multiplier multiplier-value on the peer switch

    For example, if

    • On the local switch, the configured interval between BFD packet transmission is 200 ms; the configured interval between BFD packet receipt is 300 ms; the detection multiplier is 4.
    • On the peer switch, the configured interval between BFD packet transmission is 100 ms; the configured interval between BFD packet receipt is 600 ms; the detection multiplier is 5.

    Then:

    • On the local switch, the actual interval between BFD packet transmission is 600 ms calculated by using the formula max {200 ms, 600 ms}; the interval between BFD packet receipt is 300 ms calculated by using the formula max {100 ms, 300 ms}; the detection period is 1500 ms calculated by multiplying 300 ms by 5.
    • On the peer switch, the actual interval between BFD packet transmission is 300 ms calculated by using the formula max {100 ms, 300 ms}, the actual interval between BFD packet receipt is 600 ms calculated by using the formula max {200 ms, 600 ms}, and the detection period is 2400 ms calculated by multiplying 600 ms by 4.

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Updated: 2019-04-01

Document ID: EDOC1000178324

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