• If the peer has not been activated in any AFI/SAFI, the peer remains in Idle state.
Most Dell Networking OS BGP IPv4 unicast commands are extended to support the IPv4 multicast RIB using extra options to the
command. For a detailed description of the MBGP commands, refer to the Dell Networking OS Command Line Interface Reference Guide.
• Enables support for the IPv4 multicast family on the BGP node.
CONFIG-ROUTER-BGP mode
address family ipv4 multicast
• Enable IPv4 multicast support on a BGP neighbor/peer group.
CONFIG-ROUTER-BGP-AF (Address Family) mode
neighbor [ip-address | peer-group-name] activate
Congure IPv6 NH Automatically for IPv6 Prex Advertised
over IPv4 Neighbor
You can congure the system to pick the next hop IPv6 address dynamically for IPv6 prex advertised over an IPv4 neighbor. If there is no
IPv6 address congured on the local interface, the system uses the IPv4 mapped IPv6 address. If there are multiple IPv6 addresses
congured on the interface, the system uses the lowest IPv6 address congured on that interface. If the conguration is already present
and a new IPv6 address, which is lower than the lowest existing address, is assigned to one of the peer interfaces, that address is not used
as the NH until you ap the interface manually.
To enable BGP to pick the next hop IPv6 address automatically for IPv6 prex advertised over an IPv4 neighbor, follow this procedure:
• Enable the system to pick the next hop IPv6 address dynamically for IPv6 prex advertised over an IPv4 neighbor.
ROUTER-BGP mode mode
neighbor {neighbor-ipv6–address | peer-group name} auto-local-address
Enter either the neighbor IPv6 address or the name of the peer group.
BGP Regular Expression Optimization
Dell Networking OS optimizes processing time when using regular expressions by caching and re-using regular expression evaluated results,
at the expense of some memory in RP1 processor.
BGP policies that contain regular expressions to match against as-paths and communities might take a lot of CPU processing time, thus
aect BGP routing convergence. Also, show bgp commands that get ltered through regular expressions can to take a lot of CPU cycles,
especially when the database is large.
This feature is turned on by default. If necessary, use the bgp regex-eval-optz-disable command in CONFIGURATION ROUTER
BGP mode to disable it.
Debugging BGP
To enable BGP debugging, use any of the following commands.
• View all information about BGP, including BGP events, keepalives, notications, and updates.
EXEC Privilege mode
debug ip bgp [ip-address | peer-group peer-group-name] [in | out]
• View information about BGP route being dampened.
EXEC Privilege mode
debug ip bgp dampening [in | out]
216
Border Gateway Protocol IPv4 (BGPv4)
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