diff options
Diffstat (limited to 'docs/configuration')
| -rw-r--r-- | docs/configuration/protocols/bgp.rst | 186 |
1 files changed, 170 insertions, 16 deletions
diff --git a/docs/configuration/protocols/bgp.rst b/docs/configuration/protocols/bgp.rst index b2858222..54d996e8 100644 --- a/docs/configuration/protocols/bgp.rst +++ b/docs/configuration/protocols/bgp.rst @@ -236,11 +236,6 @@ Route Selection This command specifies the default local preference value. The local preference range is 0 to 4294967295. -.. cfgcmd:: set protocols bgp <asn> parameters default no-ipv4-unicast - - This command allows the user to specify that IPv4 peering is turned off by - default. - .. cfgcmd:: set protocols bgp <asn> parameters deterministic-med This command provides to compare different MED values that advertised by @@ -272,14 +267,66 @@ Network Advertisement This command is used for advertising IPv4 or IPv6 networks. - .. note:: By default, the BGP prefix is advertised even if it's not - present in the routing table. This behaviour differs from the - implementation of some vendors. + .. note:: By default, the BGP prefix is advertised even if it's not present in + the routing table. This behaviour differs from the implementation of some vendors. .. cfgcmd:: set protocols bgp <asn> parameters network-import-check This configuration modifies the behavior of the network statement. - If you have this configured the underlying network must exist in the rib + If you have this configured the underlying network must exist in the + routing table. + +Route Aggregation +----------------- + +.. cfgcmd:: set protocols bgp <asn> address-family <ipv4-unicast|ipv6-unicast> aggregate-address <prefix> + + This command specifies an aggregate address. The router will also + announce longer-prefixes inside of the aggregate address. + +.. cfgcmd:: set protocols bgp <asn> address-family <ipv4-unicast|ipv6-unicast> aggregate-address <prefix> as-set + + This command specifies an aggregate address with a mathematical set of + autonomous systems. This command summarizes the AS_PATH attributes of + all the individual routes. + +.. cfgcmd:: set protocols bgp <asn> address-family <ipv4-unicast|ipv6-unicast> aggregate-address <prefix> summary-only + + This command specifies an aggregate address and provides that + longer-prefixes inside of the aggregate address are suppressed + before sending BGP updates out to peers. + +Redistribution +-------------- + +.. cfgcmd:: set protocols bgp <asn> address-family <ipv4-unicast|ipv6-unicast> redistribute connected + + Redistribute connected routes to BGP process. + +.. cfgcmd:: set protocols bgp <asn> address-family <ipv4-unicast|ipv6-unicast> redistribute kernel + + Redistribute kernel routes to BGP process. + +.. cfgcmd:: set protocols bgp <asn> address-family <ipv4-unicast|ipv6-unicast> redistribute ospf + + Redistribute OSPF routes to BGP process. + +.. cfgcmd:: set protocols bgp <asn> address-family <ipv4-unicast|ipv6-unicast> redistribute rip + + Redistribute RIP routes to BGP process. + +.. cfgcmd:: set protocols bgp <asn> address-family <ipv4-unicast|ipv6-unicast> redistribute static + + Redistribute static routes to BGP process. + +.. cfgcmd:: set protocols bgp <asn> address-family <ipv4-unicast|ipv6-unicast> redistribute <route source> metric <number> + + This command specifies metric (MED) for redistributed routes. The + metric range is 0 to 4294967295. + +.. cfgcmd:: set protocols bgp <asn> address-family <ipv4-unicast|ipv6-unicast> redistribute <route source> route-map <name> + + This command allows to use route map to filter redistributed routes. Peers ----- @@ -291,7 +338,7 @@ Defining Peers This command creates a new neighbor whose remote-as is NASN. The neighbor address can be an IPv4 address or an IPv6 address or an interface to use - for the connection. + for the connection. The command it applicable for peer and peer group. .. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> remote-as internal @@ -307,12 +354,17 @@ Defining Peers .. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> shutdown - This command disable the peer. To reenable the peer use the delete - form of this command. + This command disable the peer or peer group. To reenable the peer use + the delete form of this command. .. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> description <text> - Set description of the peer. + Set description of the peer or peer group. + +.. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> update-source <address|interface> + + Specify the IPv4 source address to use for the BGP session to this neighbour, + may be specified as either an IPv4 address directly or as an interface name. Capability Negotiation ^^^^^^^^^^^^^^^^^^^^^^ @@ -379,7 +431,8 @@ Peer Parameters The number parameter (1-10) configures the amount of accepted occurences of the system AS number in AS path. - This command is only allowed for eBGP peers. + This command is only allowed for eBGP peers. It is not applicable + for peer groups. .. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> address-family <ipv4-unicast|ipv6-unicast> as-override @@ -397,7 +450,7 @@ Peer Parameters .. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> address-family <ipv4-unicast|ipv6-unicast> attribute-unchanged <as-path|med|next-hop> This command specifies attributes to be left unchanged for - advertisements sent to a peer. + advertisements sent to a peer or peer group. .. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> address-family <ipv4-unicast|ipv6-unicast> maximum-prefix <number> @@ -428,8 +481,109 @@ Peer Parameters This command specifies a default weight value for the neighbor’s routes. The number range is 1 to 65535. +.. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> advertisement-interval <seconds> + + This command specifies the minimum route advertisement interval for + the peer. This number is between 0 and 600 seconds, with the default + advertisement interval being 0. + +.. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> disable-connected-check + + This command allows peerings between directly connected eBGP peers + using loopback addresses without adjusting the default TTL of 1. + +.. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> ebgp-multihop <number> + + This command allows sessions to be established with eBGP neighbors + when they are multiple hops away. When the neighbor is not directly + connected and this knob is not enabled, the session will not establish. + The number of hops range is 1 to 255. + +.. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> local-as <asn> [no-prepend] [replace-as] + + Specify an alternate AS for this BGP process when interacting with + the specified peer or peer group. With no modifiers, the specified + local-as is prepended to the received AS_PATH when receiving routing + updates from the peer, and prepended to the outgoing AS_PATH (after + the process local AS) when transmitting local routes to the peer. + + If the :cfgcmd:`no-prepend` attribute is specified, then the supplied + local-as is not prepended to the received AS_PATH. + + If the :cfgcmd:`replace-as` attribute is specified, then only the supplied + local-as is prepended to the AS_PATH when transmitting local-route + updates to this peer. + + Note that replace-as can only be specified if no-prepend is. + This command is only allowed for eBGP peers. + +.. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> passive + + Configures the BGP speaker so that it only accepts inbound connections + from, but does not initiate outbound connections to the peer or peer group. + +.. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> ttl-security hops <number> + + This command enforces Generalized TTL Security Mechanism (GTSM), + as specified in :rfc:`5082`. With this command, only neighbors + that are the specified number of hops away will be allowed to + become neighbors. The number of hops range is 1 to 254.This + command is mutually exclusive with :cfgcmd:`ebgp-multihop`. + +Peer Groups +^^^^^^^^^^^ + +Peer groups are used to help improve scaling by generating the same update +information to all members of a peer group. Note that this means that the +routes generated by a member of a peer group will be sent back to that +originating peer with the originator identifier attribute set to indicated +the originating peer. All peers not associated with a specific peer group +are treated as belonging to a default peer group, and will share updates. + +.. cfgcmd:: set protocols bgp <asn> peer-group <name> + + This command defines a new peer group. You can specify to the group + the same parameters that you can specify for specific neighbors. + +.. cfgcmd:: set protocols bgp <asn> neighbor <address|interface> peer-group <name> + + This command bind specific peer to peer group with a given name. + +General configuration +--------------------- + +.. cfgcmd:: set protocols bgp <asn> maximum-paths <ebgp|ibgp> <number> + + This command defines the maximum number of parallel routes that + the BGP can support. In order for BGP to use the second path, the + following attributes have to match: Weight, Local Preference, AS + Path (both AS number and AS path length), Origin code, MED, IGP + metric. Also, the next hop address for each path must be different. + +.. cfgcmd:: set protocols bgp <asn> parameters default no-ipv4-unicast + + This command allows the user to specify that IPv4 peering is turned off by + default. + +.. cfgcmd:: set protocols bgp <asn> parameters log-neighbor-changes + + Tis command enable logging neighbor up/down changes and reset reason. + +.. cfgcmd:: set protocols bgp <asn> parameters no-client-to-client-reflection + + Tis command disables route reflection between route reflector clients. + By default, the clients of a route reflector are not required to be + fully meshed and the routes from a client are reflected to other clients. + However, if the clients are fully meshed, route reflection is not required. + In this case, use the :cfgcmd:`no-client-to-client-reflection` command + to disable client-to-client reflection. + +.. cfgcmd:: set protocols bgp <asn> parameters no-fast-external-failover + + Disable immediate sesison reset if peer's connected link goes down. + Timers ------- +^^^^^^ .. cfgcmd:: set protocols bgp <asn> timers holdtime <seconds> |