Questions tagged [ldp]

A tag for the Label Distribution Protocol (LDP), a protocol in which routers capable of Multiprotocol Label Switching (MPLS) exchange label mapping information.

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49 views

What is the difference between Targeted LDP and Directed LDP in MPLS?

Please explain the main differences (use cases) between Targeted LDP and Directed LDP in MPLS ?
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How are labels in LDP “Label Mapping Message” associated with IP prefix?

Let's say, that I have two directly connected routers r1 and r2. For example, I do see that the r2 sends a Label Mapping Message to r1 and provides several labels including 21(0x15): r1 associates ...
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Why are the LDP installed LSPs not seen in the output of “show mpls lsp” in Junos?

I have established a LDP session between routers r1(lo0.0 has 192.168.1.1 configured) and r4(lo0.0 has 192.168.1.4 configured). According to show route table inet.3 192.168.1.4 in r1 the BGP prefixes ...
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Secure MPLS configuration: Does TCP port 646 (LDP) need to be generally exposed?

I am looking for expertise on MPLS configurations and security. A recent Nmap scan of my organization's public IPv4 perimeter networks has discovered a system which appears to be listening on TCP port ...
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256 views

PE route down in LDP based VPLS Connection in Juniper MX

I am observing 'PE route down message ' against LDP based VPLS connection on Juniper MX. The IGP protocol is IS-IS. LDP VPLS connectivity is point to point (having only two end points). When I check ...
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158 views

LDP: which FEC an egress router has to advertise when using Ordered Control?

If an egress router knows how to reach a set of distinct and indipendent networks (say, two or more non overlapping IP prefixes in its routing table), is it expected to announce one single FEC for ...
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1answer
41 views

LDP: which FEC to advertise when using Ordered Control?

I have the following doubt: if an egress router knows how to reach a set of subnets, is it expected to bind all those remote destinations in just a FEC (one label) or has it to bind a label for each ...
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1answer
62 views

H-VPLS application with different types of VPLS

so ive been digging around VPLS for a while and i have come across a term H-VPLS. My knowledge is: VPLS can be signalled using LDP (manual or autodiscovery) or BGP (autodiscovery). H-VPLS: ...
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264 views

mLACP / MC-LAG between Cisco / Juniper

I am working on a LDP signalled VPLS topology (picture) What I am trying to accomplish here is to establish a redundant connection to CE1. CE1 has both interfaces in a port-channel with an IP. My ...
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71 views

IGP vs LDP forwarding

By default when MPLS and LDP is configured in a cisco IOS/IOSXR and some IGP. If I forward a packet toward internal IP. Router will use MPLS to get destination. When show the routing table I only can ...
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523 views

Does LDP not generate a label for default route for ISIS Level 2?

LDP generates local bindings for all the routes in the routing table. I configured an ISIS topology such that: R1 ----- R2 ----- R3 ----- R4 ----- R5 L1 L1/2 L2 L1/2 L1 ...
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714 views

Why VPWS service - MPLS has a two ethernet frame headers?

I am trying to understand VPWS services, and going through RFC 4448, Encapsulation Methods for Transport of Ethernet over MPLS Networks. Here is the packet capture: Why there is a need for again ...
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How are the LERs determined in an MPLS LSP using LDP

Preface; In the below topology R1 and R6 are PEs, all others are P routers, all routers are running c7200-jk9s-mz.124-13b.bin. At this point IGP is fully converged (OSPF with all interfaces in area 0 ...
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2answers
905 views

Label to Route mapping, Label generation scalability

In MPLS enabled routers, is a unique label generated per Destination prefix in routing Table or is it per Next-hop in the routing table if not both, how is the mapping between unique labels and ...
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1answer
3k views

What is a FEC in MPLS domain?

Does FEC correspond to a Next-hop ipaddress or Destination Ipaddress or a combination of Next-hop/Destination Ipaddress and QOS values ?
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1answer
512 views

Can 2 peering LSR generate same Label to same or different prefix and distribute among them?

Scope of the MPLS labels are within a router or within a interface right ?. So which means the peering neighbor LSR router can generate label values of its own.So say with below mpls topology. |LSR1|-...
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2k views

VPLS Multihoming on Junos - FEC confusion‏

I'm going over the VPLS multihoming options on Juniper's web site. I'm not concerned with LAG and MC-LAG for the moment. As far as I'm aware: FEC128 is when you are using manual discovery of ...
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1answer
6k views

How to force VPLS/L2VPN to use a specific path

We're using VPLS and L2VPN on Juniper MX for L2 connections. Signaling is done via BGP and label distribution via LDP. Now we want one L2VPN to use a specific path trough the network and not follow ...