Design Reference
Table Of Contents
- Contents
- Chapter 1: Introduction
- Chapter 2: New in this release
- Chapter 3: Network design fundamentals
- Chapter 4: Hardware fundamentals and guidelines
- Chapter 5: Optical routing design
- Chapter 6: Platform redundancy
- Chapter 7: Link redundancy
- Chapter 8: Layer 2 loop prevention
- Chapter 9: Spanning tree
- Chapter 10: Layer 3 network design
- Chapter 11: SPBM design guidelines
- Chapter 12: IP multicast network design
- Multicast and VRF-lite
- Multicast and MultiLink Trunking considerations
- Multicast scalability design rules
- IP multicast address range restrictions
- Multicast MAC address mapping considerations
- Dynamic multicast configuration changes
- IGMPv3 backward compatibility
- IGMP Layer 2 Querier
- TTL in IP multicast packets
- Multicast MAC filtering
- Guidelines for multicast access policies
- Multicast for multimedia
- Chapter 13: System and network stability and security
- Chapter 14: QoS design guidelines
- Chapter 15: Layer 1, 2, and 3 design examples
- Chapter 16: Software scaling capabilities
- Chapter 17: Supported standards, RFCs, and MIBs
- Glossary
Figure 29: Multiple regions separated by EBGP
You can obtain AS numbers from the Inter-Network Information Center (NIC) or use private
AS numbers. If you use private AS numbers, be sure to design your Internet connectivity
carefully. For example, you can introduce a central, well-known AS to provide interconnections
between all private ASs and the Internet. Before it propagates the BGP updates, this central
AS strips the private AS numbers to prevent them from leaking to providers.
The following figure illustrates a design scenario in which you use multiple OSPF regions to
peer with the Internet.
Figure 30: Multiple OSPF regions peering with the Internet
Border Gateway Protocol
Network Design Reference for Avaya VSP 4000 February 2014 71