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L3 Routing & Multicasting
Typical Enterprise Network Design
Layer 3 Feature by place in Network
Layer 3 Access Consideration
• Advantages
 Lower L2 table utilization
 Smaller L2 domain eliminate STP
• Drawbacks
 More L3 configuration points
 VM mobility constrained to a smaller L2
domain
• Use OSPF stub area, EIGRP
stub or static default routes
• Fabric Extender technology
enables larger L2 domains
without adding STP hops
Layer 3 Aggregation Considerations
Nexus 7000 Layer 3 and MPLS Support
Comparison of I/O Module
Licence
• Enterprise Services License - all routing protocols
except RIP
• MPLS License – MPLS features
• XL License – higher FIB table sizes (optional)
• Base - all other Layer 3 features (SVIs, Layer 3 ports,
FHRP, IGMP etc)
Nexus 5500 L3 Support
5500 L3 Licence
Nexus 2000 FEX L3 / MPLS
IP Unicast Routing and Forwarding
NX-OS and Nexus 7000 Unicast
Routing Architecture
NX-OS Unicast Routing Protocols
Platform Support
NX-OS Unicast Routing Protocols
Configuration Highlights
Management and Troubleshooting
Highlights
Router-id Selection Process
OSPF in NX-OS
OSPF
EIGRP in NX-OS
EIGRP
BGP
• Full MP-BGP support
• BGP version 4 (RFC 4271)
• Multi-Protocol Extensions (RFC 2858)
• Integrated implementation for IPv4 and IPv6
• Route Reflector support for all Afs
• BGP Dynamic Capability (draft-ietf-idr-
dynamic-cap-14)
• 4 byte ASN support and interoperability (RFC
4893)
BGP

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