ELTEX ESR-3100 - 12.1 LDP configuration

ESR series service routers.ESR-Series. User manual
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12.1 LDP configuration
LDP is a tag distribution protocol. To find the neighbors hello messages are sent to the multicast address
224.0.0.2. When exchanging hello messages, routers learn each other's transport addresses. A router with a
bigger address initializes the TCP session. After checking the parameters, the LDP session is considered
established.
ESR routers support the following LDP operation modes:
Tag information exchange mode — Downstream Unsolicited;
Mechanism for controlling the distribution of tags — Independent Label Distribution Control;
Label retention mode — Liberal Label Retention;
12.1.1 Configuration algorithm
Step Description Command Keys
1 In the context of MPLS parameters
configuration, specify the interfaces
involved in the MPLS switching
process
esr(config-mpls)# forwarding
interface { <IF> | <TUN> }
<IF> – an interface's name,
specified in the form described in
Section Types and naming order
of router interfaces;
<TUN> – the name of the tunnel
is specified as described in
section Types and naming order
of router tunnels;
2 Specify the router-id for LDP (not
necessary if transport-address is
specified).
esr(config-ldp)# router-id <ID> <ID> – router identifier, defined
as AAA.BBB.CCC.DDD where
each part takes values of
[0..255].
3 In the context of the address family
ipv4 settings, specify transport-
address (not necessary if router-id is
specified).
esr(config-ldp-af-ipv4)#
transport-address <ADDR>
<ADDR> – defined as
AAA.BBB.CCC.DDD where each
part takes values of [0..255].
4 In the context of the address family
ipv4 settings, specify interfaces for
enabling LDP process.
esr(config-ldp-af-ipv4)# interface
{ <IF> | <TUN> }
<IF> – an interface's name,
specified in the form described in
Section Types and naming order
of router interfaces;
<TUN> – the name of the tunnel
is specified as described in
section Types and naming order
of router tunnels.
On interfaces where LDP and MPLS switching are enabled, the firewall must be disabled.
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The current version LDP only works with IPv4 addresses.
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