Design Reference

Figure 25: 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. The VSP
4000 supports a total of 16000 eBGP routes. The maximum FIB size for IPv4 routes is also
16000.
Routing domain interconnection with BGP
You can implement BGP so that autonomous routing domains, such as OSPF routing domains,
connect. This connection allows the two different networks to begin communicating quickly
over a common infrastructure, thus providing additional time to plan the IGP merger. Such a
scenario is particularly effective when you need to merge two OSPF area 0.0.0.0s (see the
following figure).
Figure 26: Routing domain interconnection with BGP
BGP and edge aggregation
You can perform edge aggregation with multiple point of presence or edge concentrations.
Virtual Services Platform 4000 supports 12 pairs (peering services). You can use BGP to inject
dynamic routes rather than using static routes or RIP (see the following figure).
Layer 3 network design
68 Network Design Reference for Avaya VSP 4000 February 2014
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