Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 242
Aggregate routes, Con BGP confederations, confederations. As with route reflectors
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www.dell.com | support.dell.com Aggregate routes FTOS provides multiple ways to aggregate routes in the BGP routing table. At least one specific route of the aggregate must be in the routing table for the configured aggregate to become active. Use the following command in the CONFIGURATION ROUTER BGP mode to aggregate routes. Command Syntax Command Mode Purpose aggregate-address ip-address mask [advertise-map map-name] [as-set] [attribute-map map-name] [summary-only] [suppress-map map-name] CONFIG-ROUTER-BGP Assign the IP address and mask of the prefix to be aggregated. Optional parameters are: • advertise-map map-name: set filters for advertising an aggregate route • as-set: generate path attribute information and include it in the aggregate. • attribute-map map-name: modify attributes of the aggregate, except for the AS_PATH and NEXT_HOP attributes • summary-only: advertise only the aggregate address. Specific routes will not be advertised • suppress-map map-name: identify which more-specific routes in the aggregate are suppressed AS_SET includes AS_PATH and community information from the routes included in the aggregated route. In the show ip bgp command, aggregates contain an 'a' in the first column and routes suppressed by the aggregate contain an 's' in the first column. FTOS#show ip bgp BGP table version is 0, local router ID is 10.101.15.13 Status codes: s suppressed, d damped, h history, * valid, > best Path source: I - internal, a - aggregate, c - confed-external, r - redistributed, n network Origin codes: i - IGP, e - EGP, ? - incomplete Network *> 7.0.0.0/29 *> 7.0.0.0/30 *>a 9.0.0.0/8 3786} ? *> 9.2.0.0/16 *> 9.141.128.0/24 FTOS# Next Hop 10.114.8.33 10.114.8.33 192.0.0.0 10.114.8.33 10.114.8.33 Metric 0 0 LocPrf Weight Path 0 18508 ? 0 18508 ? 32768 18508 701 {7018 2686 0 18508 701 i 0 18508 701 7018 2686 ? Configure BGP confederations Another way to organize routers within an AS and reduce the mesh for IBGP peers is to configure BGP confederations. As with route reflectors, BGP confederations are recommended only for IBGP peering involving a large number of IBGP peering sessions per router. Basically, when you configure BGP confederations, you break the AS into smaller sub-AS, and to those outside your network, the confederations appear as one AS. Within the confederation sub-AS, the IBGP neighbors are fully meshed and the MED, NEXT_HOP, and LOCAL_PREF attributes are maintained between confederations. 242 | Border Gateway Protocol IPv4 (BGPv4)
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