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Dell SmartFabric OS10 Installation, Upgrade, and Downgrade Guide

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VLT upgrade with minimal loss in a VLT or VXLAN topology if network statements are used to advertise BGP prefixes

NOTE:The following procedure is not applicable when upgrading to 10.5.2.6 or future releases from 10.5.1.x releases. You can directly upgrade VLT nodes from 10.5.1.x to 10.5.2.6 or future release.
NOTE:
  • This section is applicable only if network statements are used under address-family {ipv4|ipv6} unicast to advertise prefixes that are present in both VLT peers.
  • If you have not used network statements and instead used redistribute connected to advertise prefixes, you avoid this additional step.
  • If the prefix advertised using a network statement is present only on one of the VLT peers, you avoid this additional step for those prefixes alone.

This section covers the additional steps needed to achieve a VLT upgrade to 10.5.2.6 or later from a 10.5.0.x or 10.4.3.x release with minimal traffic loss in a VLT or VXLAN topology.

NOTE: The steps in the following example are for IPv4. Follow the same steps for IPv6 where applicable.
  1. Apply a route map to set the origin as IGP for the prefixes on both VLT peers in a VLT domain one after the other. 
    OS10# configure terminal
OS10(config)# route-map set_origin
OS10(config-route-map)# set origin igp
OS10(config-route-map)# exit
OS10(config)# router bgp <AS-Number>
OS10(config-router-bgp-<AS-Number>)# address-family ipv4 unicast
OS10(configure-router-bgpv4-af)# network <prefix> route-map set_origin
OS10(configure-router-bgpv4-af)# end
OS10#
  2. Follow the VLT min-loss upgrade procedure outlined above.
  3. Remove the route-map on both VLT peers one after the other. 
    OS10(config)# router bgp <AS-Number>
OS10(config-router-bgp-<AS-Number)# address-family ipv4 unicast
OS10(configure-router-bgpv4-af)# no network <prefix> route-map set_origin
OS10(configure-router-bgpv4-af)# network <prefix>
OS10(configure-router-bgpv4-af)#

For more information on the network command, see the BGP commands section in the Dell SmartFabric OS10 User Guide.

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