Dell S4048T-ON, Руководство по настройке

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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 route-
map 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 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.
When you configure a peer to support IPv4 multicast, Dell Networking OS takes the following actions:
• Send a capacity advertisement to the peer in the BGP Open message specifying IPv4 multicast as a supported AFI/SAFI (Subsequent
Address Family Identifier).
• If the corresponding capability is received in the peer’s Open message, BGP marks the peer as supporting the AFI/SAFI.
• When exchanging updates with the peer, BGP sends and receives IPv4 multicast routes if the peer is marked as supporting that AFI/
SAFI.
• Exchange of IPv4 multicast route information occurs through the use of two new attributes called MP_REACH_NLRI and
MP_UNREACH_NLRI, for feasible and withdrawn routes, respectively.
224 Border Gateway Protocol IPv4 (BGPv4)