ESR series service routers.ESR-Series. User manual
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Step Description Command Keys
3 Specify VRF instance, in which the 
given GRE tunnel will operate 
(optional).
esr(config-gre )# ip vrf forwarding 
<VRF>
<VRF> – VRF name, set by the 
string of up to 31 characters.
4 Specify the description of the 
configured tunnel (optional).
esr(config-gre)# description 
<DESCRIPTION>
<DESCRIPTION> – tunnel 
description, set by the string of 
up to 255 characters.
5 Set local IP address for tunnel 
installation.
esr(config-gre)# local address 
<ADDR>
<ADDR> – gateway IP address, 
defined as AAA.BBB.CCC.DDD 
where each part takes values of 
[0..255].
esr(config-gre)# local interface <IF> <IF> – interface IP address of 
which is used for the tunnel 
installation.
6 Set remote IP address for tunnel 
installation.
esr(config-gre)# remote address 
<ADDR>
<ADDR> – gateway IP address, 
defined as AAA.BBB.CCC.DDD 
where each part takes values of 
[0..255].
7 Specify the GRE tunnel encapsulation 
mode.
esr(config-gre)# mode <MODE> <MODE> – GRE tunnel 
encapsulation mode:
ip – encapsulation of IP 
in GRE;
ethernet – 
encapsulation of 
Ethernet frames in GRE.
Default value: ip
8 Set the IP address of a tunnel local 
side (only in ip mode).
esr(config-gre)# ip address <ADDR/
LEN>
<ADDR/LEN> – IP address and 
prefix of a subnet, defined as 
AAA.BBB.CCC.DDD/EE where 
each part AAA-DDD takes 
values of [0..255] and EE takes 
values of [1..32].
Up to 8 IP addresses can be 
specified separated by 
commas.
For advanced IPv4 addressing 
features see section IP 
addressing configuration.