Configuring BGP

enabled

Enable/disable an OSPF router:

• on

• off

asn

An autonomous system is a system of IP networks and routers managed by one or more operators that have a single routing policy. The autonomous system number identifies the router as belonging to that system.

redistribute

BGP route redistribution:

• connected: redistribute routes to the networks directly connected to UserGate

• kernel: redistribute routes added by the administrator.

• ospf: redistribute routes received via the OSPF protocol.

routemaps

Routemaps are used to manage routing tables and specify the match conditions under which routes are passed between domains.

To create a routemap or change parameters for an existing routemap, use the following commands:

Admin@nodename# set network virtual-router <virtual-router-name> bgp routemaps new Admin@nodename# set network virtual-router <virtual-router-name> bgp routemaps <routemap-name>

Routemap parameters:

• name: routemap name.

• description: routemap description.

• action: action:

  • allow: allow data that matches the routemap conditions to pass through

  • block: deny data that matches the routemap conditions to pass through.

• match-by: match condition to apply a routemap. Match by:

  • ip: IP address.

  • aspath: AS path.

  • community: Community.

• next-hop: set next hop value for filtered routes to the specified IP address.

• weight: set the weight for filtered routes to the specified value.

• metric: set the metric for filtered routes to the specified value.

• preference: set the preference for filtered routes to the specified value.

• as-prepend: set the AS-prepend value, which is a list of autonomous systems being added for this route.

• community: set the BGP community value for filtered routes.

• append-community: append community.

• ip-match: add all required IP addresses when selecting IP address matching.

• as-path-match: add all required autonomous network numbers when selecting AS path matching. POSIX 1003.2 regular expressions are allowed, supplemented by the underscore (_) character that is interpreted as:

  • A space

  • A comma

  • Start of line

  • End of line

  • AS set delimiter { and }

  • AS confederation delimiter ( and ).

  • community-match: add the strings of all desired BGP communities when matching by Community is selected.

neighbors

BGP neighbors.

To add new neighbors or change data for existing ones, use the following commands:

Admin@nodename# set network virtual-router <virtual-router-name> bgp neighbors new Admin@nodename# set network virtual-router <virtual-router-name> bgp neighbors <host-ip>

Parameters:

• enabled: enable/disable use of the neighbor:

  • on

  • off

• description: BGP neighbor description.

• host: neighbor IP address.

• remote-asn: neighbor's autonomous system number.

• weight: weight of routes received from this neighbor.

• ttl: maximum allowed hop number to this neighbor.

• allowas-in: allows receiving and processing routes even if the router detects its own autonomous system number on the AS Path in the aggregation route.

  • on

  • off

• allowas-in-number: how many times the autonomous BGP neighbor's system number can be included in the AS Path. Available values: from 0 to 10 (0 is the origin).

• bfd: Add a bfd profile (Bidirectional Forwarding Detection). Bfd profiles are created in the element library, read more in the Configuring Libraries section.

• next-hop-self: if the neighbor is a BGP, replace the next-hop-self value with its own IP address:

  • on

  • off

• ebgp-multihop: the connection to this BGP neighbor is not direct (more than one hop):

  • on

  • off

• route-reflector-client: determine if a BGP neighbor is a Route reflector client:

  • on

  • off

• soft-reconfiguration: use soft reconfiguration (without disconnecting) to update the configuration:

  • on

  • off

• default-originate: announce the default route to a neighbor:

  • on

  • off

• send-community: redirect the community to BGP neighbors.

  • on

  • off

• enable-auth: enable/disable authentication for the neighbor.

  • on

  • off

• password: the neighbor authentication password.

• filter-in: restrict routing information received from neighbors.

• filter-out: restrict routing information announced to neighbors.

• routemap-in: restrict routing information that BGP receives from neighbors.

• routemap-out: restrict routing information that BGP sends to neighbors.