Cisco C9200L Stack Kit Spare – C9200L-STACK-KIT=

Overview

Stacking

Cisco Catalyst 9200 Series switch models are designed for stacking switches as a single virtual switch, enabling customers to have a single management plane and control plane for up to 384 access ports.

Stacking architecture

Ring architecture

When the stack is operating in a full ring, it can deliver high-speed throughput of up to 160 Gbps on each Cisco Catalyst 9200 Series Switch and throughput of 80 Gbps on each Cisco Catalyst 9200L switch. This multifold performance improvement is possible by combining the new internal Cisco Unified Access^® Data Plane Application-Specific Integrated Circuit (UADP ASIC) and dual stack ports.

The high-speed backplane of the Cisco Catalyst 9200 Series stack-ring fabric is constructed by daisy-chaining the stack-member switches with Cisco proprietary cables that connect rear-side stack ports. The stack fabric consists of six unidirectional data transmission rings.

Figure 5 illustrates the 9200 Series StackWise-160 internal forwarding architecture.

Figure 6 illustrates the StackWise-80 internal forwarding architecture for the 9200L models.

The aggregated throughput that a stack of switches supports is a combination of two primary factors:

●   Total transmission rings: Each stack connector bundles multiple individual cables that carry data across the stack ring. This cabling structure creates four internal stack rings. This hardware design significantly improves the data transmission performance of each stack port of a Cisco Catalyst 9200 Series Switch.

●   Maximum throughput per ring: Each stack ring can transmit data at up to 40 Gbps on StackWise-160 and up to 20 Gbps on StackWise-80. These four internal stack rings enable an aggregated throughput of up to 80 Gbps per switch (up to 160 Gbps of unicast with Spatial Reuse Protocol [SRP]).

Table 2 lists the major details of the stacking architecture.

Table 2.       Details of the Cisco StackWise architecture

Stack discovery

Once all switches are powered on and the stack interfaces are up, the Stack Discovery Protocol (SDP) discovers the stack topology using broadcasts. Neighbor information is shared with all other switches in the stack. In a full ring, discovery exits after all the members are found. In a half ring, the system waits for two minutes. Once all switches are discovered, switch numbers are determined. After switch number conflicts are resolved, the information is stored in a flash variable block for future use. Active election begins after discovery exits.

The following command can be used to check the status of the stack cable and to identify the neighbor device of the stack cable.

Table 5 lists the supported stacking options.

Table 5.        Supported stacking options

Mixed stacking is not supported. You cannot stack fixed (C9200L SKUs) with modular (C9200 SKUs) models, or other Catalyst switches, e.g. Cisco Catalyst 2960-X and 2960-XR Series. Stacking not available on C9200CX Series switches.

The optional StackWise-160 and StackWise-80 kits consist of two adapters and a stacking cable. The default stacking cable is 0.5 m, but options of 1 m and 3 m are also available.

Table 6 lists the stacking accessories.

Table 6.        Stacking accessories

Cisco Catalyst 9200 Series Switch stacked units

Technical Specification : C9200L-STACK-KIT=

Disclaimer : Technical specification may differ from the above specified, refer cisco.com for product specific complete details.