Entering And Exiting The Address Family Configuration Level; Filtering Specific Ip Addresses - Dell PowerConnect B-RX Configuration Manual

The CLI displays a warning message such as the following.
BigIron RX(config)# no router bgp
router bgp mode now disabled. All bgp config data will be lost when writing to
flash!
The Web management interface does not display a warning message.
If you are testing a BGP4 configuration and are likely to disable and re-enable the protocol, you
might want to make a backup copy of the startup configuration file containing the protocol's
configuration information. This way, if you remove the configuration information by saving the
configuration after disabling the protocol, you can restore the configuration by copying the backup
copy of the startup configuration file onto the flash memory.
To disable BGP4 without losing the BGP4 configuration information, remove the local AS (for
example, by entering the no local-as <num> command). In this case, BGP4 retains the other
configuration information but is not operational until you set the local AS again.

Entering and exiting the address family configuration level

The BGP address family has a unicast or multicast sub-level.
To enter the IPv4 BGP unicast address family configuration level, enter the following command.
BigIron RX(config-bgp)# address-family ipv4 unicast
BigIron RX(config-bgp)#
NOTE
The CLI prompt for the global BGP level and the BGP address-family IPv4 unicast level are the same.
To enter the IPv4 BGP multicast address family configuration level, enter the following command.
BigIron RX(config-bgp)# address-family ipv4 multicast
BigIron RX(config-bgp-ipv4m)#
Syntax: [no] address-family ipv4 unicast | ipv4 multicast
The default is the ipv4 unicast address family level.
To exit an address family configuration level, enter the following command.
BigIron RX(config-bgp-ipv6u)# exit-address-family
BigIron RX(config-bgp)#
Syntax: exit-address-family

Filtering specific IP addresses

You can configure the router to explicitly permit or deny specific IP addresses received in updates
from BGP4 neighbors by defining IP address filters. The router permits all IP addresses by default.
You can define up to 100 IP address filters for BGP4.
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BigIron RX Series Configuration Guide
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Entering and exiting the address family configuration level
If you want permit to remain the default behavior, define individual filters to deny specific IP
addresses.
If you want to change the default behavior to deny, define individual filters to permit specific IP
addresses.
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