Dell BigIron RX Series, Configuration Manual

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BigIron RX Series Configuration Guide 745
53-1002253-01
Configuring BGP4
26
As a guideline, BigIron RX switches with a 2 GB Management 4 module can accommodate 150 –
200 neighbors, with the assumption that the BigIron RX receives about one million routes total
from all neighbors and sends about eight million routes total to neighbors. For each additional one
million incoming routes, the capacity for outgoing routes decreases by around two million.
Configuring BGP4
Once you activate BGP, you can configure the BGP options. On a BigIron RX there are two
configuration levels: global and address family.
At the global level, all BGP configurations apply to IPv4 and IPv6. You enter this layer using the
router bgp command.
Under the global level, you specify an address family . Address families separate the IPv4 and IPv6
BGP configuration. You enter this level by entering the address-family command at the router bgp
level. The command requires you to specify the IPv4 or IPv6 network protocol.
The address family command also requires you to select a sub-address family, which is the type of
routes for the configuration. You specify multicast or unicast routes.
FIGURE 112 BGP configuration levels
Table 26.1 shows what commands are available at the various BGP configuration levels.
TABLE 120
IPv4 BGP commands at different configuration levels
Command Global
(iPv4 and
IPv6) IPv4 address
family unicast IPv4 address
family
multicast See
address-family x x x “Entering and exiting the address family
configuration level”
on page 751
address-filter x “Filtering specific IP addresses” on page 751
aggregate-address x x “Aggregating routes advertised to BGP4
neighbors”
on page 759
always-compare-med x “Configuring the device to always compare
MEDs”
on page 759
as-path-filter x
router bgp
Global commands for BGP
and all address families
address-family
IPv4
address-family
IPv6 unicast
Commands for IPv6
BGP unicast routes
unicast
Commands for IPv4
MBGP routes
multicast
Commands for IPv4
BGP unicast routes