9.5 LT tunnels configuration
LT (англ. Logical Tunnel) is a type of tunnels dedicated for transmission of routing information and traffic
between different virtual routers (VRF Lite) configured on a router. LT tunnel might be used for organization of
interaction between two or more VRF using firewall restrictions.
9.5.1 Configuration algorithm
Step Description Command Keys
1 Create LT tunnels for each of existing
VRF.
esr(config)# tunnel lt <ID> <ID> – tunnel identifier, set in
the range of [1..128].
2 Specify the description of the
configured tunnels (optionally).
esr(config-lt)# description
<DESCRIPTION>
<DESCRIPTION> – tunnel
description, set by the string of
up to 255 characters.
3 Include each LT tunnel in the
corresponding VFR.
esr(config-lt)# ip vrf forwarding
<VRF>
<VRF> – VRF name, set by the
string of up to 31 characters.
4 Include each LT tunnel in a security
zone and configure interaction rules
between zones or disable firewall for LT
tunnel.
esr(config-lt)# security-
zone<NAME>
<NAME> – security zone name,
set by the string of up to 12
characters.
esr(config-lt)# ip firewall disable
5 For each LT tunnel, set the opposite LT
tunnel number (in another VRF).
esr(config-lt)# peer lt <ID> <ID> – tunnel identifier, set in
the range of [1..128].
6 For each LT tunnel, specify IP address
for packets routing. For interacting LT
tunnels, IP addresses should locate in
one IP subnet.
esr(config-lt)# 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].
7 Enable the tunnels. esr(config-lt)# enable
8 For each VRF configure required routing
protocols via LT tunnel.
9 Specify the time interval during which
the statistics on the tunnel load is
averaged (optionally)
esr(config-lt)# load-average
<TIME>
<TIME> – interval in seconds,
takes values of [5..150].
Default value: 5
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