Leading Cisco networking products distributor-3Anetwork.com Cisco Stacking Switches—StackWise and StackWise Plus

1. Cisco Stacking Switches—StackWise and StackWise Plus
Stackable Switch
 Allows access to all switches with a single IP address
 Provides the means to manage the stack via CLI or MIB
 Can connect all switches in a physical ring topology
 Traffic flows in either direction of the ring, some Resiliency
 Automatic Master selection & backup 1:N
 Automatic IOS versioning and Update!
 Automatic configuration of new members
 Automatic unit replacement (configuration of old switch retained)
 Stateful switch over in case of master failures
 Ring resiliency similar to FDDI, provides HA and Resiliency
 Sub-millisecond Master failover
 Smart Multicast
 Cross-stack features (Etherchannel and QoS)
Cisco StackWise (Plus)
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2. Logical and physical ring architecture of the Catalyst 3k
Comprises two 16 Gbps counter-rotating rings
-Data on both rings when fully connected:
Stackwise-32 Gbps
Stackwise Plus-64 Gbps
Internal Connection:
 On Cisco 3750V2, 3750G: The Stack Ring is the switching fabric
 Cisco 3750E, 3750X: The Stack Ring only interconnects the individual Switch
Fabrics
Understanding the Stack Cable
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3. Eight TX/RCV pairs per ring
That is 16 pairs (8 channels per ring)
Each TX/RCV pair has 2 traces that use differential signaling.
That is 32 traces in total
Each TX/RCV pair runs at 2.5 Gbps
8B/10B encoding is used.
(for every ten bits sent, eight bits are data and two bits are overhead)
Understanding the Stack Ring Speed
16 Channels x 2.5 Gbps x 8B/10B = 32Gbps
Or bidirectional 16 Gbps per cable = 32Gbps
Or Two Rings running at 16Gpbs each = 32Gbps
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4. Stackwise Vs Stackwise Plus
Spatial Reuse
Note: These are packets not tokens. There is only 1 token per ring.
Ring Healing
 The switch fabric or port ASIC closest to cable detects link down
-Criteria is coding violations in a period of time
-Loss of at most one packet that was being transmitted when ring broke
-Just microseconds for hardware to detect failure
 Each switch signals a bad link to stack its partner
 Both ends of the cable loop back on themselves
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5. It refers from
http://d2zmdbbm9feqrf.cloudfront.net
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Email: info@3Anetwork.com
Address: 23/F Lucky Plaza, 315-321 Lockhart Road, Wanchai, Hongkong
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6. It refers from
http://d2zmdbbm9feqrf.cloudfront.net
More related topics
More Cisco products and Reviews you can visit: http://www.3anetwork.com/blog
3Anetwork.com is a world leading Cisco networking products supplier, we supply original
new Cisco networking equipments, including Cisco Catalyst switches, Cisco routers,
Cisco firewalls, Cisco wireless products, Cisco modules and interface cards products at
competitive price and ship to worldwide.
Our website: http://www.3anetwork.com
Telephone: +852-3069-7733
Email: info@3Anetwork.com
Address: 23/F Lucky Plaza, 315-321 Lockhart Road, Wanchai, Hongkong
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