Reference Guide

Figure 22. Before and After AS Number Migration with Local-AS Enabled
When you complete your migration, and you have reconfigured your network with the new information, disable this feature.
If you use the “no prepend” option, the Local-AS does not prepend to the updates received from the eBGP peer. If you do not
select “no prepend” (the default), the Local-AS is added to the first AS segment in the AS-PATH. If an inbound route-map is
used to prepend the as-path to the update from the peer, the Local-AS is added first. For example, consider the topology
described in the previous illustration. If Router B has an inbound route-map applied on Router C to prepend "65001 65002" to
the as-path, the following events take place on Router B:
1. Receive and validate the update.
2. Prepend local-as 200 to as-path.
3. Prepend "65001 65002" to as-path.
Local-AS is prepended before the route-map to give an impression that update passed through a router in AS 200 before it
reached Router B.
BGP4 Management Information Base (MIB)
The FORCE10-BGP4-V2-MIB enhances support for the BGP management information base (MIB) with many new simple
network management protocol (SNMP) objects and notifications (traps) defined in draft-ietf-idr-bgp4-mibv2-05. To see these
enhancements, download the MIB from the Dell website.
NOTE: For the Force10-BGP4-V2-MIB and other MIB documentation, refer to the Dell iSupport web page.
Border Gateway Protocol IPv4 (BGPv4) 139