- Written by Shyam Kota
- Posted on June 12, 2019
- Updated on June 12, 2019
- 6739 Views
When a switchport receives its own STP BPDU, the port goes into role ‘Backup’ and state ‘Discarding’. The
- Written by Xuan Qi
- Posted on October 20, 2022
- Updated on September 19, 2024
- 6295 Views
EVPN gateway support for all-active (A-A) multihoming adds a new redundancy model to our multi-domain EVPN solution introduced in [1]. This deployment model introduces the concept of a WAN Interconnect Ethernet Segment identifier (WAN I-ESI). The WAN I-ESI allows the gateway’s EVPN neighbors to form L2 and L3 overlay ECMP on routes re-exported by the gateways. The identifier is shared by gateway nodes within the same domain (site) and set in MAC-IP routes that cross domain boundaries.
- Written by Jeevan Kamisetty
- Posted on December 22, 2020
- Updated on December 22, 2020
- 10843 Views
Arista MLAG supports STP for Layer 2 loop detection. In fact, most customers enable STP in their MLAG(s) to ensure no
- Written by Daniel Guerin
- Posted on October 20, 2022
- Updated on November 3, 2022
- 5821 Views
Spanning Tree Protocol requires each interface to have a unique port number ranging from 1 through 4095. Arista STP typically assigns port numbers to port-channel interfaces in the order in which they are configured.
- Written by Kailin Zhang
- Posted on July 2, 2024
- Updated on July 3, 2024
- 1240 Views
The new feature maintains STP restartability while a portfast-enabled port’s link status changes. In older releases, when portfast is enabled on an interface and the interface is flapping, i.e., going up and down, STP becomes non-restartable. After the new feature is introduced, STP remains restartable during port flapping. This may be applicable in several scenarios, but the most common usage is to keep STP restartable after endpoints are connected and disconnected. This feature is important for SSU because an SSU can only be performed while STP is restartable. After the portfast port's link status changes, SSU can still be conducted.
- Written by Dongping Zhu
- Posted on March 3, 2023
- Updated on August 10, 2023
- 5666 Views
Leaf Smart System Upgrade (SSU) provides the ability to upgrade the EOS image with minimal traffic disruption. To perform the SSU, Spanning Tree Protocol (STP) should either be disabled or configured as MSTP. Meanwhile, all ports should be configured with admin edge ports (i.e., all ports are supposed to connect to host only) and the BPDU guard should be enabled for all edge ports.