Huawei Quidway S6500 Series Operation Manual page 248

Operation Manual - Routing Protocol
Quidway S6500 Series Ethernet Switches
Table 6-33 Comparing the MED Routing Metrics from the Peers in Different ASs
Comparing the MED Routing Metrics
from the Peers in Different ASs
Configure not to compare the MED
routing metrics from the peers in
different ASs
By default, MED comparison is not allowed among the routes from the neighbors in
different ASs.
It is not recommended to use this configuration unless you can make sure that the ASs
adopt the same IGP and routing method.
6.2.15 Configuring BGP Community
Community attributes are optional and transitive. Some community attributes are
globally recognized, which are called basic community attributes, whereas some are
for special purposes which are called advanced community attributes. You may define
not only the basic community but also the advanced community attributes.
Community-list is used to identify a community, which falls into basic community-list
and advanced community-list.
In addition, a route can have more than one community attributes. In a route, the
speaker of multiple community attributes can act according to one, several or all the
attributes. Router can choose to change the community attribute or leave it unchanged
before transmitting the route to its peers.
Perform the following configurations in system view.
Table 6-34 Configuring community
Operation
Configure
community list
Configure an advanced
community list
Remove the configured
community list
By default, no BGP community is configured.
Operation
ip community-list
a basic
{ permit
no-export-subconfed | no-advertise | no-export }
ip community-list adv-community-list-number { permit
| deny } as-regular-expression
undo ip community-list { basic-community-list-number
| adv-community-list-number }
Huawei Technologies Proprietary
6-21
Chapter 6 BGP Configuration
Command
compare-different-as-med
undo compare-different-as-med
Command
basic-community-list-number
| deny } { aa:nn | internet |