Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 224

ipv6-unicast commands. Irrespective of whether the BGP neighbors are disabled earlier, the shutdown all command brings down all the configured BGP neighbors. When you issue the no shutdown all command, all the BGP neighbor neighbors are enabled. However, when you re-enable all the BGP neighbors in global configuration mode, only the neighbors that were not in disabled state before the global shutdown come up. Meaning, BGP neighbors corresponding to the IPv4 unicast or multicast groups and the IPv6 unicast groups that were explicitly disabled before the global shutdown remains in disabled state. Use the no shutdown address-family-ipv4-unicast, no shutdown address-family-ipv4-multicast, or no shutdown address-family-ipv6-unicast commands to enable these neighbors. NOTE: This behavior applies to all BGP neighbors. Meaning, BGP neighbors that were explicitly disabled before global shutdown also remain in disabled state. Enable these neighbors individually using the no shutdown command. Route Map Continue The BGP route map continue feature, continue [sequence-number], (in ROUTE-MAP mode) allows movement from one routemap entry to a specific route-map entry (the sequence number). If you do not specify a sequence number, the continue feature moves to the next sequence number (also known as an "implied continue"). If a match clause exists, the continue feature executes only after a successful match occurs. If there are no successful matches, continue is ignored. Match a Clause with a Continue Clause The continue feature can exist without a match clause. Without a match clause, the continue clause executes and jumps to the specified route-map entry. With a match clause and a continue clause, the match clause executes first and the continue clause next in a specified route map entry. The continue clause launches only after a successful match. The behavior is: • A successful match with a continue clause-the route map executes the set clauses and then goes to the specified route map entry after execution of the continue clause. • If the next route map entry contains a continue clause, the route map executes the continue clause if a successful match occurs. • If the next route map entry does not contain a continue clause, the route map evaluates normally. If a match does not occur, the route map does not continue and falls-through to the next sequence number, if one exists Set a Clause with a Continue Clause If the route-map entry contains sets with the continue clause, the set actions operation is performed first followed by the continue clause jump to the specified route map entry. • If a set actions operation occurs in the first route map entry and then the same set action occurs with a different value in a subsequent route map entry, the last set of actions overrides the previous set of actions with the same set command. • If the set community additive and set as-path prepend commands are configured, the communities and AS numbers are prepended. Enabling MBGP Configurations Multiprotocol BGP (MBGP) is an enhanced BGP that carries IP multicast routes. BGP carries two sets of routes: one set for unicast routing and one set for multicast routing. The routes associated with multicast routing are used by the protocol independent multicast (PIM) to build data distribution trees. Dell EMC Networking OS MBGP is implemented per RFC 1858. You can enable the MBGP feature per router and/or per peer/peer-group. The default is IPv4 Unicast routes. 224 Border Gateway Protocol version 4 (BGPv4)