I see that Root ID Priority and Bridge ID Priority have the same value (32769), what does it mean? What could happen if the numbers were different?
I know that the current switch is a Root Bridge but why I have two types of ID: Root ID and Bridge ID?
I see (priority 32768 sys-id-ext 1) where 1 is the current VLAN 1 and 32768 + 1 = 32769 but what does it mean?
(.......sys-id-ext 1) is the 12-bit PVST+ field that is placed into the BPDU so it can carry multiple-VLAN information, is it correct?
2) the last rows of the output show interfaces (Gi1/1, Gi1/2), but the type shown is P2p. I thought that P2p is for serial interface used in lised lines (WAN network) where the interface are seial (not shared link).
The Bridge ID priority will always show the priority of the switch for that VLAN. The Root ID priority is the root bridge has for the VLAN. If the numbers were different, you are most likely not in the root bridge.
As for the Bridge ID Priority field and the sys-ext-id, this is used because every switch has an identity in spanning-tree. A bridge ID is seperated into 2 parts, the 2 Byte Bridge Priority field and 6 Bytes MAC address. However, since you will be running PVST, there is a chance that some vlans can have the same MAC address and the same Bridge Priority. Therefore, the sys-ext-id is added in the Bridge Priority to allow for Per-Vlan Spanning Tree to give the switch a unique Bridge ID.
The last P2P/SHR status shows the type of link. The P2P means that the link is using full duplex and is also running the same version of spanning-tree. If the SHR was used, it would mean that you are running at half duplex. P2P doesn't have to be set only on Serial interfaces.
Hi,I've had below topology: So from RT1's perspective, if link RT1 - RT5 is the link to be protected, the P-space (RT1, Redlink) will be RT2? I can see the definition of P space of RT1 is the set of nodes that RT1 can reach as per pre-convergenc...
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Cisco IOS-XE 17.3.1 – Catalyst Switching Updates
Table of Contents
Hardware Additions since IOS-XE 17.2.1
Key Summary Features
Platform and Infra Features
High Availability Features
Routing / MPLS / VPN Features