### JunosE 11.3.0 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.

> #### DHCP

> - Support for DHCP External Server, DHCP Local Server, DHCP Relay, and DHCP Relay Proxy on POS Access Interfaces

> The following packet over SONET (POS) module combinations on E Series routers now support configuration of the DHCP external server, DHCP local server, DHCP relay, and DHCP relay proxy applications, alone or in combination, when the POS module is the access interface:

> - POS module combinations on the E120 router and the E320 router:
> - ES2 4G LM with ES2-S1 OC12-2 STM4 POS IOA
> - ES2 4G LM with ES2-S1 OC48 STM16 POS IOA
> - POS module combinations on ERX14xx models, ERX7xx models, and the ERX310 router:
> - OCx/STMx POS line module with OC3-4 I/O module
> - OCx/STMx POS line modules with OC12/STM4 I/O module
> - OC48 line module with OC48 FRAME APS I/O module

> In the current release, this feature is available for early field test purposes only.

> You can configure DHCP external server, DHCP local server, DHCP relay, and DHCP relay proxy on these POS modules in either a virtual router (VR) or a VPN routing and forwarding instance (VRF).

> As part of this feature, the pos keyword has been added to the existing i p dhcp-local limit command. To specify the maximum number of IP addresses that the DHCP local server application can supply to all POS access interfaces or to a specific POS access interface, in the range 0–96000, use the ip dhcp-local limit command with the new pos keyword. For example:

> ! Set the IP address limit for all POS access interfaces to 1000

> host1(config)#ip dhcp-local limit pos 1000

> ! Set the IP address limit for the specified POS access interface to 2000

> host1(config)#ip dhcp-local limit interface pos 5/0/0 2000

> ! Restore the IP address limit for all POS access interfaces to the default value, ! 48000

> host1(config)#no ip dhcp-local limit pos

> To display the maximum number of IP address leases available for POS access interfaces, use the existing show ip dhcp-local limits command. For example:

> host1#show ip dhcp-local limits
> *****************************************
> DHCP Local Server Address Limits
> ATM Limit - 48000
> VLAN Limit - 48000
> POS Limit - 1000
> Ethernet Limit - 48000

> #### 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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