Large Network Configuration Issues
The default BGP behavior on Cisco routers may require fine-tuning for use in large networks. This section examines the motivation behind this tuning and how it is performed. This section first discusses BGP configuration commands that affect the overall behavior of BGP, and then explains commands that apply on a per-BGP-neighbor basis.
BGP Configuration Issues
IGP synchronization is enabled by default in the Cisco BGP implementation. This indicates that prefixes learned via IBGP are not advertised to EBGP neighbors until a corresponding prefix, derived from an IGP, appears in the routing table. This behavior ensures that the local AS does not offer transit to destinations until the routes for those destinations ...
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