Information Technology Reference
In-Depth Information
Table 9-5 Service Level Definitions
Service Level
BGP Community
Gold
<ISP ASN>:500
Silver
<ISP ASN>:510
Bronze
<ISP ASN>:520
Inbound traffic from a customer is easy to handle. Policy marking can be configured on
the inbound customer interface to mark all traffic to the appropriate service level. The
difficulty is marking traffic destined for the customer coming into the ISP network from
transit and peering links.
The solution is to mark customer prefixes with a community that identifies the service level
for that destination prefix. This allows the use of the BGP table-map feature to populate
the CEF table with the appropriate precedence for each destination prefix, enabling incom-
ing precedence manipulation on a per-prefix basis. The BGP table map, as described in
Chapter 4, “Effective BGP Policy Control,” is a filter between the BGP table and the CEF
table. Example 9-8 shows the extensions to the customer-facing route maps.
Community Route Map Extensions for QPPB
Example 9-8
! Gold Service Route Maps
route-map gold_cust_inbound permit 10
match community 10
set community 100:3000 100:500 additive
set local-preference 80
!
route-map gold_cust_inbound permit 20
match community 11
set community 100:3000 100:500 additive
set local-preference 90
!
route-map gold_cust_inbound permit 30
match community 12
set community 100:3000 100:500 additive
set local-preference 110
!
route-map gold_cust_inbound permit 40
match community 13
set community 100:3000 100:500 additive
set local-preference 120
!
route-map gold_cust_inbound permit 50
set community 100:3000 100:500 additive
set local-preference 100
!
! Silver Service Route Maps
route-map silver_cust_inbound permit 10
match community 10
 
Search WWH ::




Custom Search