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NE40E V800R010C10SPC500 Configuration Guide - IP Routing 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Routing
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Configuring BGP Best-external

Configuring BGP Best-external

Border Gateway Protocol (BGP) Best-external can speed up route convergence if the primary link fails.

Usage Scenario

If multiple routes to the same destination are available, a BGP device selects one optimal route based on BGP route selection policies and advertises the route to its BGP peers. This optimal route may be advertised by either an External Border Gateway Protocol (EBGP) peer or an Internal Border Gateway Protocol (IBGP) peer.

However, in scenarios with master and backup provider edges (PEs) or route reflectors (RRs), if routes are selected based on the preceding policies and the primary link fails, the BGP route convergence takes a long time because no backup route is available. To address this problem, configure BGP Best-external on the backup PE or RR.

The following figures show the networking with master and backup PEs or RRs.

Figure 10-14 Networking with master and backup PEs
Figure 10-15 Networking with master and backup RRs

In the preceding networkings, BGP Best-external must be enabled on PE2 and RR2.

Pre-configuration Tasks

Before configuring BGP Best-external, configure basic BGP functions.

Configuration Procedures

  1. Run system-view

    The system view is displayed.

  2. Run bgp as-number

    The BGP view is displayed.

  3. Run bestroute best-external

    The device is enabled to select BGP Best-external routes.

  4. Run peer { ipv4-address | group-name } advertise best-external

    The device is enabled to advertise Best-external routes to the specified peer or peer group.

  5. Run commit

    The configuration is committed.

Checking the Configurations

After route summarization is configured, you can check whether the configuration is correct.

  • Run the display bgp peer verbose command to check whether the device has been enabled to advertise BGP Best-external routes to a specified peer or peer group.

# Run the display bgp peer verbose command to view whether the device has been enabled to advertise BGP Best-external routes to the specified peer or peer group. The command output shows that the device has been enabled to advertise BGP Best-external routes to the specified peer or peer group.

<HUAWEI> display bgp peer 180.0.0.2 verbose
BGP Peer is 180.0.0.2,  remote AS 100
         Type: IBGP link
         BGP version 4, Remote router ID 180.0.0.2
         Update-group ID: 2
         BGP current state: Established, Up for 00h34m37s
         BGP current event: KATimerExpired
         BGP last state: OpenConfirm
         BGP Peer Up count: 1
         Received total routes: 1
         Received active routes total: 1
         Advertised total routes: 0
         Port: Local - 54430        Remote - 179
         Configured: Connect-retry Time: 32 sec
         Configured: Active Hold Time: 180 sec   Keepalive Time:60 sec
         Received  : Active Hold Time: 180 sec
         Negotiated: Active Hold Time: 180 sec   Keepalive Time:60 sec
         Peer optional capabilities:
         Peer supports bgp multi-protocol extension
         Peer supports bgp route refresh capability
         Peer supports bgp 4-byte-as capability
         Address family IPv4 Unicast: advertised and received
 Received: Total 43 messages
                  Update messages                2
                  Open messages                  1
                  KeepAlive messages             40
                  Notification messages          0
                  Refresh messages               0
 Sent: Total 46 messages
                  Update messages                3
                  Open messages                  1
                  KeepAlive messages             42
                  Notification messages          0
                  Refresh messages               0
 Authentication type configured: None
 Last keepalive received: 2013-03-17 12:28:05+00:00
 Minimum route advertisement interval is 15 seconds
 Optional capabilities:
 Route refresh capability has been enabled
 4-byte-as capability has been enabled
 Send community has been configured
 Send best-external has been configured
 Peer Preferred Value: 0
 Routing policy configured:
 No routing policy is configured
 TCP MSS configured value: 200
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Updated: 2019-01-03

Document ID: EDOC1100055018

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