# Service IOA

> IOA label | ES2-S1 SERVICE IOA
> Number of IOA ports | 0
> Software release | First supported: 7.0.1
> Description | 10 W maximum Full-height module Provides tunnel server functionality Pairs with associated line module to receive data from and transmit data to other line modules with ingress and egress ports
> Capability | Tunnelling Provides support for: Distance Vector Multicast Routing Protocol (DVMRP) tunnels, also known as IP-in-IP tunnels Generic Routing Protocol (GRE) tunnels L2TP-dedicated tunnel server IP packet reassembly for tunnels MPLS over GRE
> Software features | See Service IOA for information about the layer 2 and layer 3 protocols and applications that this module combination supports.
> Model compatibility | E320 router E120 router
> Line module compatibility | ES2 4G LM ES2 10G ADV LM
> SRP module compatibility | SRP-100 SRP-120 SRP-320
> Module redundancy support | Not applicable
> Port redundancy support | Not applicable
> Cables and connectors | Not applicable
> LEDs | OK (green)—Self-test passed FAIL (red)—Failure detected ONLINE (green)—Online with no alarms or errors
> Alarms, errors, and events | See Monitoring Tunnel-Service Interfaces in JunosE Physical Layer Configuration Guide, Chapter 6, Managing Tunnel-Service and IPSec-Service Interfaces.