Stacking and Link Aggregation on Alcatel Switches
1. Stacking on Alcatel Switches
Stacking is a technique that allows multiple physical switches to be combined into a single logical switch, simplifying management and improving scalability.
Stacking Ports: Ports 1/1/27 and 1/1/28 are dedicated stacking ports.
Stacking Cables: Special high-speed cables (SFP+ or QSFP+) are required.
Configuration: Stacking is usually auto-detected but requires the same switch model and firmware.
2. Link Aggregation (LAG)
Link Aggregation (LAG) combines multiple physical ports into a single logical connection to enhance bandwidth and reliability.
Ports Used: Use standard ports (1/1/1 to 1/1/24). Stacking ports cannot be used.
Configuration Example
# On Switch 1
linkagg lacp agg 22 size 2 admin-state enable
linkagg lacp port 1/1/1 actor admin-key 22
linkagg lacp port 1/1/2 actor admin-key 22
# On Switch 2
linkagg lacp agg 22 size 2 admin-state enable
linkagg lacp port 1/1/1 actor admin-key 22
linkagg lacp port 1/1/2 actor admin-key 22
3. Why Can’t Stacking Ports Be Used for LAG?
- Design Purpose: Stacking ports are for internal switch communication.
- Optimization: These ports are high-speed but not for standard network traffic.
- Hardware Limitation: Stacking ports do not support LAG.
4. Summary
✅ Stacking: Use ports 1/1/27 and 1/1/28 with the appropriate stacking cables.
✅ LAG: Use standard ports (1/1/1 to 1/1/24). Do not use stacking ports for LAG.
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