Shulou(Shulou.com)06/01 Report--

VPC (virtual Port-Channel) technology. The following figure is a traditional and vPC-based logical topology diagram of switch interconnection. VPC technology can be implemented on Cisco Nexus 7000 series products.

When the traditional technology is used to realize the interconnection of switches, if there is a loop in the interconnection structure, it will block some of the branches in the loop. VPC technology enables the use of port-channel to connect two uplink switches on a single device, using all uplink bandwidth, eliminating STP blocked ports, and providing fast convergence in the event of link/device failure.

The advantages of VPC design over traditional design are shown in the following figure.

Virtual switching system VSS (Virtual Switch System). Two Cisco Catalyst 6500 series switches can be connected through VSS as if they were operating a single logical switch. As shown in the following picture.

There are some differences between virtual switching system VSS and vPC technology, for example, in the control level, the two switches are primary and secondary, but they are dual-active in data processing.

6500-VSS for data center access: no longer need complex, difficult to diagnose STP; can simplify management, achieve a management point, a routing and STP node; the total system bandwidth is increased to 1.4Tbps.

6500-VSS is applied to the core / aggregation layer: virtualize the network system; provide stateful handover (SSO) between chassis, improve uninterrupted communication, the switching time is less than 200ms; EtherChannel across chassis, optimize path selection.

Comparison of VSS and vPC Technology

ACE module to achieve server load balancing and SSL, a physical device can be virtualized into different functional areas, the virtual functional area has independent configuration files, routing tables, application rule settings and so on.

Firewall module FWSM, which can realize up to 250virtual firewalls.

Virtual LAN VLANs can be shared when needed, such as VLAN 10 on the left of the figure above, and each virtual firewall can have its own policy settings.

An example of joint application of virtual technology is shown in the following figure.

The design examples of ACE and FWSM modules under the VSS technology framework are shown in the following figure.

The deployment design of network services in the aggregation layer.

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