What is path cost of spanning tree path cost?
What is path cost of spanning tree path cost?
SW3 receives BPDUs on its 10 Mbit interface (cost 100) and on its 1000 Mbit interface (cost 4). It will use its 1000 Mbit interface as its root port (shortest path to the root bridge is 19+19+4=42). SW3 will forward BPDUs to SW4. The root path cost field will be 100….Spanning-Tree Cost Calculation.
| Bandwidth | Cost |
|---|---|
| 100 Mbit | 19 |
| 1000 Mbit | 4 |
What is the STP path cost for 1gbps links?
IEEE 802.1t Path Cost Parameter Values
| Link Speed | Recommended Value | Range |
|---|---|---|
| 10 Mbps | 2.000.000 | 1-200.000.000 |
| 100 Mbps | 200.000 | 1-200.000.000 |
| 1 Gbps | 20.000 | 1-200.000.000 |
| 10 Gbps | 2.000 | 1-200.000.000 |
Which of the following are valid 802.1 D port types?
Explanation: The valid IEEE 802.1D port types are root port and designated port. Alternate port and backup port are port roles defined in 802.1W RSTP.
What is difference between STP and RSTP?
The main difference between Rapid Spanning Tree Protocol (RSTP IEEE 802.1W) and Spanning Tree Protocol (STP IEEE 802.1D) is that Rapid Spanning Tree Protocol (RSTP IEEE 802.1W) assumes the three Spanning Tree Protocol (STP) ports states Listening, Blocking, and Disabled are same (these states do not forward Ethernet …
What is max age timer in STP?
Default max age timer is 20 seconds. You can tune the Spanning Tree Protocol (STP) max age timer to any value between 6 and 40 sec.
What is the STP cost of a 10 Mbps link?
Specifically, 1 Gbps links were assigned a port cost of 1, 100 Mbps link a cost of 10, and 10 Mbps links a cost of 100.
Is STP Cisco proprietary?
There are many types of STP variants. Some of them are Cisco proprietary, some of them are standardized by IEEE. Cisco’s proprietary variants are Per-VLAN Spanning Tree Protocol (PVST), Per-VLAN Spanning Tree Protocol Plus (PVST+) and Rapid PVST+.
How is RSTP faster than STP?
The STP process to determine network state transitions is slower than the RSTP process because it is timer-based. A device must reinitialize every time a topology change occurs. RSTP converges faster because it uses a handshake mechanism based on point-to-point links instead of the timer-based process used by STP.
What is diameter STP?
the diameter is the maximal amount of switches between the two farthest points in a LAN (not to the root bridge) Correct. The default max age value is 20 seconds and is increased by every switch in the network by one (start at the root bridge with 0).
