Merge pull request #189896 from tanuballa/patch-197

PRMerger-2 · web-flow · commit 4827ab0ba4f2 · 2022-02-27T23:44:03.000+05:30
add note about bgp availability down
diff --git a/articles/expressroute/maintenance-alerts.md b/articles/expressroute/maintenance-alerts.md
@@ -16,6 +16,7 @@ ExpressRoute uses Azure Service Health to notify you of planned and upcoming Exp
 > [!NOTE]
 > * During a maintenance activity or in case of unplanned events impacting one of the connection, Microsoft will prefer to use AS path prepending to drain traffic over to the healthy connection. You will need to ensure the traffic is able to route over the healthy path when path prepend is configured from Microsoft and required route advertisements are configured appropriately to avoid any service disruption. 
 > * Terminating ExpressRoute BGP connections on stateful devices can cause issues with failover during planned or unplanned maintenances by Microsoft or your ExpressRoute Provider. You should test your set up to ensure your traffic will failover properly, and when possible, terminate BGP sessions on stateless devices.
+> * During maintenance between the Microsoft edge and core network, BGP availability will appear down even if the BGP session between the customer edge and Microsoft edge remains up. For information about maintenance between the Microsoft edge and core network, make sure to have your maintenance alerts turned on and configured correctly using the guidance below.
 >
 
 ## View planned maintenance

Original file line number	Diff line number	Diff line change
`@@ -16,6 +16,7 @@ ExpressRoute uses Azure Service Health to notify you of planned and upcoming Exp`
`16`	`16`	`> [!NOTE]`
`17`	`17`	`> * During a maintenance activity or in case of unplanned events impacting one of the connection, Microsoft will prefer to use AS path prepending to drain traffic over to the healthy connection. You will need to ensure the traffic is able to route over the healthy path when path prepend is configured from Microsoft and required route advertisements are configured appropriately to avoid any service disruption.`
`18`	`18`	`> * Terminating ExpressRoute BGP connections on stateful devices can cause issues with failover during planned or unplanned maintenances by Microsoft or your ExpressRoute Provider. You should test your set up to ensure your traffic will failover properly, and when possible, terminate BGP sessions on stateless devices.`
	`19`	`+> * During maintenance between the Microsoft edge and core network, BGP availability will appear down even if the BGP session between the customer edge and Microsoft edge remains up. For information about maintenance between the Microsoft edge and core network, make sure to have your maintenance alerts turned on and configured correctly using the guidance below.`
`19`	`20`	`>`
`20`	`21`
`21`	`22`	`## View planned maintenance`