### JunosE 12.0.0 Release Notes

> ### Early Field Trial Features

> The features described in this section are present in the code but have not yet been fully qualified by Juniper Networks. These features are available only for field test purposes in this release. If you use any of these features before they have been fully qualified, it is your responsibility to ensure that the feature operates correctly in your targeted configuration.

> #### IS-IS

> - Support for Disregarding the Attach Bit in Level 1 LSPs

> You can configure IS-IS to disregard the Attach Bit (ATT) in level 1 LSPs in a multiarea environment. In level 1 routing, the closest level 1-2 router determines the default routes within IS-IS routing domains. The attach bit in the level 1 LSP determines the closest level 1-2 router. The ability to disregard the attach bit enables IS-IS to prevent default routes from being installed.

> You can use the ignore-attached-bit command to disregard the attach bit in level 1 LSPs. For example:

> host1(config-router)# ignore-attached-bit

> The following command has been added in this release:

> ignore-attached-bit

> This feature is limited in this release to early field trial purposes only.

> - Ability to Advertise IP Prefixes of Passive Interfaces

> You can configure IS-IS to advertise IP prefixes that belong to only passive interfaces. Enabling this feature causes only connected passive IP prefixes to be retained and all other entries ro be removed from the LSP database. Disabling this command restores all the entries in the LSP database, thus allowing all IP prefixes to be advertised.

> You can use the advertise-passive-only command to advertise IP prefixes of passive interfaces only. For example:

> host1(config-router)# advertise-passive-only

> Configuring IS-IS to advertise only passive interfaces reduces network convergence time between two integrated IS-IS systems.

> The following command has been added in this release:

> advertise-passive-only

> This feature is limited in this release to early field trial purposes only.

> #### Stateful Line Module Switchover (High Availability)

> - Support for Stateful Line Module Switchover on ES2 4G LMs with ES2-ES1 Service IOA on E120 and E320 Routers

> JunosE Software now supports high availability for ES2 4G line modules configured with Service IOAs on E120 and E320 routers. These line modules function in a 1:1 redundancy mode with the active module as the primary line module and the spare or standby module as the secondary line module. This functionality of high availability for line modules is also referred to as stateful line module switchover.

> Stateful line module switchover reduces the impact on subscriber traffic during a stateful switchover from the active line module to the standby line module by ensuring that existing subscriber sessions remain active with a brief disconnection in traffic. Stateful line module switchover maintains user sessions and reduces data forwarding outage to a brief duration through the router during the switchover, thereby improving the overall availability of the router.

> The following commands have been added or modified to support configuration and monitoring of stateful line module switchover:

> line-card switch | show redundancy history line-card
> mode high-availability slot | show redundancy line-card

> As part of this feature, the following SNMP MIB objects have been added to the Juniper Networks Redundancy MIB to support the stateful line module switchover functionality:

> - juniLcRedundancyActiveSlot
> - juniLcCardRedundancyStandbySlot
> - juniLcRedundancyLastResetReason
> - juniLcRedundancyActivationType
> - juniLcRedundancyHaActiveTime
> - juniLcRedundancySwitchoverTime

> In addition, the ha event log category has been modified to record information when the system transitions from one high availability state to another, when a stateful line module switchover is performed.

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