• Author : Zhen Xue


Support for PTP on MLAG

From the Precision Time Protocol (PTP) perspective, Multi-Chassis Link Aggregation (MLAG) peers are two physical devices (clocks) maintaining timing information independently of each other. However, from the networking perspective, for the devices connected to the MLAG, it appears as a single logical device to which they are connected via a LAG interface on their side and an MLAG port-channel interface on the MLAG side. Since different PTP messages sent on the LAG-to-MLAG link might be placed on different LAG member interfaces, they may end up on different MLAG peers. Because PTP relies on the fact that the path taken by...
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Seamless BFD for SR-TE policies

Description Bidirectional Forwarding Detection (BFD) is a protocol that provides low-overhead, short-duration detection of failures of arbitrary paths between two systems. Seamless Bidirectional Forwarding Detection (S-BFD) defines a simplified mechanism for using BFD with a large proportion of negotiation aspects eliminated, thus providing benefits such as quick provisioning and improved control and flexibility for network nodes initiating path monitoring. Segment Routing Traffic Engineering Policy (SR-TE) makes use of Segment Routing to allow a headend to steer traffic along any path without maintaining per flow state in every node. A headend steers traffic into an “SR-TE tunnel”. Currently, traffic is forwarded...
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Switchover on Sysdb restart

For modular systems operating under the SSO redundancy policy, if  the system database agent (Sysdb) on the active supervisor restarts, the system will trigger a switchover and the standby supervisor will take over to become the new active. The system will go through a hitless transition. Status If Sysdb restarts, leading to a switchover event, the previously active supervisor will reload and the following command can be used to display the reload cause: Arista#show reload cause Reload Cause 1: ------------------- Stateful switchover requested due to Sysdb failure. Reload Time: Reload occurred at Mon Mar 23 14:48:08 2015 PDT Syslog Messages The following...
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