### JunosE 12.2.0 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 ip 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

> #### IP

> - Support for Sending ICMP Unreachable Messages for Static Routes Configured on Null 0 Interfaces

> The ES2 10G, ES2 10G Uplink, and ES2 10G ADV LMs now support the functionality to configure the router to send ICMP unreachable messages for static routes configured on null 0 interfaces.

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