3com 3031 Instruccion De Instalación

C

HAPTER

 42: BGP C

ONFIGURATION

By default, no BGP community is configured.

standard-community-list-number valued 1 to 99; while 
extended-community-list-number valued 100 to 199.

Using 

 command, you can filter the vpn-target extended 

community of the received routing information.

By default, the system performs the filter on the vpn-target extended community 
of the received routing information.

BGP support Classless Inter-Domain Routing (CIDR) and supports route 
aggregation. There are two modes of BGP route aggregation: summary automatic 
and aggregate. The former is to aggregate the IGP subnet routes redistributed by 
BGP. After summary automatic is configured, BGP cannot receive subnet routes 
redistributed by IGP. The manual aggregate is to aggregate the local BGP routes. A 
series of parameters can be configured in the aggregate mode. In general, the 
preference of the aggregate is higher than that of the summary automatic.

Perform the following configurations in BGP view.

Configure a 
standard-community-list

ip community-list 
standard-community-list-number { permit | deny 
} { aa:nn | internet | no-export-subconfed | 
no-advertise | no-export }

Configure an 
extended-community-list

ip community-list 
extended-community-list-number { permit | deny 
} as-regular-expression

Remove the configured 
community list

undo ip community-list { 
standard-community-list-number | 
extended-community-list-number }

Table 653   Configuring community attribute

Table 654   Configuring the filter on the Vpn-target community

Perform the filter on the vpn-target extended community of 
the received routing information

Cancel the filter function

Table 655   Configuring BGP route aggregation

Configure the summary automatic 
function of the subnet routes

Cancel the summary automatic 
function of the subnet routes

Configure local route aggregation 
function

aggregate address mask [ as-set ] [ 
detail-suppressed ] [ suppress-policy 
route-policy-name ] [ origin-policy 
route-policy-name ] [ 
attribute-policy route-policy-name ]