Chapter 11. Additional Data Center Interconnect Design Considerations

This chapter addresses several key technologies and issues that you should consider when interconnecting data centers, including the following:

• Multicast

• Alignment of spanning tree, HSRP, and active service modules

• Routing design

• QinQ MAC overlapping

• Storm control

• QoS considerations

• Stateful switchover

• OSPF cost

• Anycast RP and router IDs

Multicast Deployment in a Layer 2 Environment

An Ethernet switch learns MAC addresses from the source MAC address field of the Ethernet frame it receives. This is because a source MAC address of any packet will always be an address of a device and will never be a multicast or a broadcast MAC address. However, a switch, by ...

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