Introduzione: 1 . Aspetto fisico
Un esempio reale
Nel seguito, a puro scopo esemplificativo, sono elencate le principali risorse offerte da uno switch a chassis di medie prestazioni:
- Fast path technology: wire-speed switching of intra-module traffic for up to 71.4 Mpps throughput.
- Fast switch fabric: high-performance switch fabric (up to 36.6 Gbps).
- latency: < 10 micros (FIFO).
- Rapid Convergence Spanning Tree Protocol (802.1w): increases network uptime through faster recovery from failed links.
- 802.3ad Link Aggregation Control Protocol (LACP): support up to 6 trunks, each with up to 4 links (ports) per trunk.
- Cisco Fast EtherChannel (FEC): supports Cisco's proprietary FEC trunking protocol.
-
VLAN : supports up to 30 port-based VLAN s, GVRP, and 802.1Q VLAN tagging.
- Port security: prevents unauthorized access using MAC address lockdown.
- Secure Shell (SSHv2): encrypts all transmitted data for secure remote access over IP networks.
- Traffic prioritization (802.1p): allows real-time traffic classification into 8 priority levels mapped to 3 queues.
- RMON and switch monitoring (SMON): provides monitoring and reporting capabilities for statistics, history, alarms.
- Stacking capability.
- Cisco Discovery Protocol (CDP): enables real-time mapping of nodes to switch ports.
- Find, fix, and inform: finds and fixes common network problems automatically, then informs administrator.
- Layer 3 static routes: enable VLAN -to- VLAN communications and up to 16 external routes - including one default route - in IP networks.
- Lifetime warranty: for as long as you own the product, with next-business-day advance replacement (available in most countries).
- Operating temperature: 32ºF to 131ºF (0ºC to 55ºC), relative humidity: 15% to 95% @ 104ºF (40ºC), non-condensing.
- Dimensions: switch XXXX: 17.4 x 15.3 x 8.75 in (44.2 x 38.9 x 22.23 cm).
- Weight: switch XXXX: 22.9 lb (10.4 kg).