ESR series service routers.ESR-Series. User manual
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Configure the physical interface gigabitethernet 1/0/3, in which TOPGATE-WAN-E1 is installed:
Set mtu equal to 1510 or more;
Switch interface to the e1 operation mode;
Specify channel e1 – 0;
Specify e1 channel range from 1 to 8.
esr# configure 
esr(config)# interface gigabitethernet 1/0/3
esr(config-if-gi)# mode switchport 
esr(config-if-gi)# mtu 1510
esr(config-if-gi)# switchport mode e1 
esr(config-if-gi)# switchport e1 slot 0
esr(config-if-gi)# switchport e1 timeslots 1-8
esr(config-if-gi)# exit
Configure e1 interface:
esr(config)# interface e1 1/0/1 
esr(config-e1)# ip address 192.0.2.1/24
esr(config-e1)# security-zone trusted 
esr(config-e1)# exit
Information about the physical state of e1 can be obtained using the following command:
esr# show controllers e1 gigabitethernet 1/0/3
Interface 'gi1/0/3':
 SFP present:     Yes
 SFP Vendor name: --
 is te:    No
 SFP Vendor PN:   --
 SFP SW Version:  LPOS 1.0.9.4SR42 (20.12.2017) [
 Line code:       HDB3
 Clock source:    Internal
 Timeslot:        1-8
 Invert Data:     No
 Framing CRC4:    No
 Loopback:        --
 CRC algorithm:   FCS16
 E1 Link:         Up
 E1 Synced:       Yes
 E1 RX AIS:       No
 E1 RX RAI:       No
 E1 TX AIS:       No