Avaya 8800 Planning And Engineering, Network Design page 127

Figure 48: BGP and Internet peering
In cases where the Internet connection is single-homed, to reduce the size of the routing table,
Avaya recommends that you advertise Internet routes as the default route to the IGP.
Routing domain interconnection with BGP
You can implement BGP so that autonomous routing domains, such as OSPF routing domains, are
connected. This allows the two different networks to begin communicating quickly over a common
infrastructure, thus giving network designers additional time to plan the IGP merger. Such a
scenario is particularly effective when network administrators wish to merge two OSPF area 0.0.0.0s
(see the following figure).
Figure 49: Routing domain interconnection with BGP
BGP and edge aggregation
You can perform edge aggregation with multiple point of presence/edge concentrations. The Avaya
Ethernet Routing Switch 8800/8600 provides 1000 or 10/100 Mbit/s EBGP peering services. To
interoperate with Multiprotocol Label Switching (MPLS) or Virtual Private Network (VPN) (RFC
2547) services at the edge, this particular scenario is ideal. You can use BGP to inject dynamic
routes rather than using static routes or RIP (see the following figure).
June 2016 Planning and Engineering — Network Design
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Border Gateway Protocol
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