ldp-tunneling with hidden route in table inet.3

Hi mates,

im experiencing an issue regarding ldp-tunneling.

The question is why some hidden routes will be generated within inet.3 routing table when ldp-tunneling is cofigurated within the LSP.

When I deactive the ldp-tunneling, the hidden routes within inet.3 are gone.

could any experts bring me some light on this?

Thanks in advance.

Kind regards
Leo Gu

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Comments

Ryan82

I'm not an expert by any means but I will try to help

Might be easier to deduce if you provided a diagram and relevent configurations. Are the hidden routes from the ldp portion of your network on the other end of your RSVP network?

What routes does this reveal: sh route table inet.3 hidden

koala0808

Many thanks for your kind reply, Ryan82.
Here is the Topo(P518/868_Using LDP through an RSVP Network in JNCIS_studyguide):
-wIG8zNE7G4FpMWuNVRjx3ZFQTUN_NsADfeQiWZLawhBiloZgEFDrO6Np9eV0Mlz0ZDkFsyOUUZYajawPK0hcZASgzNUsjuZ37k=w1024

-wIG8zNE7G4FpMWuNVRjx3ZFQTUN_NsADfeQiWZLawhBiloZgEFDrO6Np9eV0Mlz0ZDkFsyOUUZYajawPK0hcZASgzNUsjuZ37k=w1024

And below is the output of "show":
================
[edit]
root@test# run show route hidden logical-router r3

inet.0: 21 destinations, 21 routes (21 active, 0 holddown, 0 hidden)

inet.3: 8 destinations, 12 routes (5 active, 0 holddown, 6 hidden)
+ = Active Route, - = Last Active, * = Both

4.4.4.4/32 [OSPF] 00:03:44, metric 3
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4
5.5.47.0/24 [OSPF] 00:03:44, metric 4
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4
5.5.48.0/24 [OSPF] 00:03:39, metric 4
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4
5.5.78.0/24 [OSPF] 00:03:44, metric 5
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4
7.7.7.7/32 [OSPF] 00:03:44, metric 4
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4
8.8.8.8/32 [OSPF] 00:03:39, metric 4
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4

mpls.0: 10 destinations, 10 routes (10 active, 0 holddown, 0 hidden)
================

================
[edit]
root@test# run show route hidden logical-router r3 detail 4.4.4.4

inet.3: 8 destinations, 12 routes (5 active, 0 holddown, 6 hidden)
4.4.4.4/32 (3 entries, 2 announced)
State: <FlashAll>
OSPF
Next hop type: Router
Next-hop reference count: 10
Next hop: 5.5.13.1 via fxp2.13 weight 0x1, selected
Label-switched-path r3->r4
Label operation: Push 100016
State: <Hidden Int>
Inactive reason: Unusable path
Local AS: 65412
Age: 4:26 Metric: 3
Area: 0.0.0.0
Task: OSPFv2
Announcement bits (1): 1-LDP
AS path: I
================

Above test has been done on my simulator and M5, whereas I encountered the same issue.

Thanks.

koala0808

Hi Ryan82,

Here you go the whole config which provides you with the interface and protocols configured:
=======================
root@test# show | no-more
## Last changed: 2011-12-11 19:11:28 UTC
version 8.5R1.14;
system {
host-name test;
domain-name MNCIF.net;
root-authentication {
encrypted-password "$1$o455j.US$XoiGr8tFjIBGwU4dRT7KT1"; ## SECRET-DATA
}
syslog {
user * {
any emergency;
}
file messages {
any notice;
authorization info;
}
file interactive-commands {
interactive-commands any;
}
}
}
logical-routers {
r1 {
interfaces {
fxp1 {
unit 12 {
vlan-id 12;
family inet {
address 5.5.12.1/24;
}
family mpls;
}
unit 13 {
vlan-id 13;
family inet {
address 5.5.13.1/24;
}
family mpls;
}
}
lo0 {
unit 1 {
family inet {
address 1.1.1.1/32;
}
}
}
}
protocols {
rsvp {
interface all;
}
mpls {
inactive: no-propagate-ttl;
interface all;
}
ospf {
traffic-engineering;
area 0.0.0.0 {
interface fxp1.12;
interface fxp1.13;
interface lo0.1;
}
}
}
routing-options {
router-id 1.1.1.1;
autonomous-system 65412;
}
}
r2 {
interfaces {
fxp1 {
unit 24 {
vlan-id 24;
family inet {
address 5.5.24.2/24;
}
family mpls;
}
}
fxp2 {
unit 12 {
vlan-id 12;
family inet {
address 5.5.12.2/24;
}
family mpls;
}
}
lo0 {
unit 2 {
family inet {
address 2.2.2.2/32;
}
}
}
}
protocols {
rsvp {
interface all;
}
mpls {
inactive: no-propagate-ttl;
interface all;
}
ospf {
traffic-engineering;
area 0.0.0.0 {
interface fxp1.24;
interface fxp2.12;
interface lo0.2;
}
}
}
routing-options {
router-id 2.2.2.2;
autonomous-system 65412;
}
}
r3 {
interfaces {
fxp1 {
inactive: unit 34 {
vlan-id 34;
family inet {
address 5.5.34.3/24;
}
family mpls;
}
unit 35 {
vlan-id 35;
family inet {
address 5.5.35.3/24;
}
family mpls;
}
unit 36 {
vlan-id 36;
family inet {
address 5.5.36.3/24;
}
family mpls;
}
}
fxp2 {
unit 13 {
vlan-id 13;
family inet {
address 5.5.13.3/24;
}
family mpls;
}
}
lo0 {
unit 3 {
family inet {
address 3.3.3.3/32;
}
}
}
}
protocols {
rsvp {
interface fxp2.13;
}
mpls {
inactive: no-propagate-ttl;
label-switched-path r3->r4 {
from 3.3.3.3;
to 4.4.4.4;
ldp-tunneling;
adaptive;
primary r3r4;
}
path r3r4 {
5.5.13.1 strict;
5.5.12.2 strict;
}
interface fxp2.13;
interface fxp1.35;
interface fxp1.36;
}
ospf {
traffic-engineering;
area 0.0.0.0 {
interface fxp1.35;
interface fxp1.36;
interface lo0.3;
interface fxp2.13;
}
}
ldp {
interface fxp1.35;
interface fxp1.36;
interface lo0.3;
}
}
routing-options {
router-id 3.3.3.3;
autonomous-system 65412;
}
}
r4 {
interfaces {
fxp1 {
unit 47 {
vlan-id 47;
family inet {
address 5.5.47.4/24;
}
family mpls;
}
unit 48 {
vlan-id 48;
family inet {
address 5.5.48.4/24;
}
family mpls;
}
}
fxp2 {
unit 24 {
vlan-id 24;
family inet {
address 5.5.24.4/24;
}
family mpls;
}
inactive: unit 34 {
vlan-id 34;
family inet {
address 5.5.34.4/24;
}
family mpls;
}
}
lo0 {
unit 4 {
family inet {
address 4.4.4.4/32;
}
}
}
}
protocols {
rsvp {
interface fxp2.24;
}
mpls {
inactive: no-propagate-ttl;
inactive: explicit-null;
label-switched-path r4->r3 {
from 4.4.4.4;
to 3.3.3.3;
ldp-tunneling;
primary r4r3;
}
path r4r3 {
5.5.24.2 strict;
5.5.12.1 strict;
}
interface fxp2.24;
interface fxp1.47;
interface fxp1.48;
}
ospf {
traffic-engineering;
area 0.0.0.0 {
interface lo0.4;
interface fxp2.24;
}
area 0.0.1.222 {
interface fxp1.47;
interface fxp1.48;
}
}
ldp {
interface fxp1.47;
interface fxp1.48;
interface lo0.4;
}
}
routing-options {
router-id 4.4.4.4;
autonomous-system 65412;
}
}
r5 {
interfaces {
fxp1 {
unit 56 {
vlan-id 56;
family inet {
address 5.5.56.5/24;
}
family mpls;
}
}
fxp2 {
unit 35 {
vlan-id 35;
family inet {
address 5.5.35.5/24;
}
family mpls;
}
}
lo0 {
unit 5 {
family inet {
address 5.5.5.5/32;
}
}
}
}
protocols {
mpls {
interface all;
}
ospf {
area 0.0.0.0 {
interface all;
}
}
ldp {
interface all;
}
}
routing-options {
router-id 5.5.5.5;
autonomous-system 65412;
}
}
r6 {
interfaces {
fxp2 {
unit 36 {
vlan-id 36;
family inet {
address 5.5.36.6/24;
}
family mpls;
}
unit 56 {
vlan-id 56;
family inet {
address 5.5.56.6/24;
}
family mpls;
}
}
lo0 {
unit 6 {
family inet {
address 6.6.6.6/32;
}
}
}
}
protocols {
mpls {
interface all;
}
ospf {
area 0.0.0.0 {
interface all;
}
}
ldp {
interface all;
}
}
routing-options {
router-id 6.6.6.6;
autonomous-system 65412;
}
}
r7 {
interfaces {
fxp1 {
unit 78 {
vlan-id 78;
family inet {
address 5.5.78.7/24;
}
family mpls;
}
}
fxp2 {
unit 47 {
vlan-id 47;
family inet {
address 5.5.47.7/24;
}
family mpls;
}
}
lo0 {
unit 7 {
family inet {
address 7.7.7.7/32;
}
}
}
}
protocols {
mpls {
interface all;
}
ospf {
area 0.0.1.222 {
interface all;
}
}
ldp {
interface all;
}
}
routing-options {
router-id 7.7.7.7;
autonomous-system 65412;
}
}
r8 {
interfaces {
fxp2 {
unit 48 {
vlan-id 48;
family inet {
address 5.5.48.8/24;
}
family mpls;
}
unit 78 {
vlan-id 78;
family inet {
address 5.5.78.8/24;
}
family mpls;
}
}
lo0 {
unit 8 {
family inet {
address 8.8.8.8/32;
}
}
}
}
protocols {
mpls {
interface all;
}
ospf {
area 0.0.1.222 {
interface all;
}
}
ldp {
interface all;
}
}
policy-options {
policy-statement static {
term 1 {
from {
protocol static;
route-filter 192.168.0.0/16 orlonger;
}
then accept;
}
}
}
routing-options {
static {
route 192.168.1.0/24 reject;
}
router-id 8.8.8.8;
autonomous-system 65412;
}
}
}
interfaces {
fxp0 {
vlan-tagging;
}
fxp1 {
vlan-tagging;
}
fxp2 {
vlan-tagging;
}
fxp3 {
vlan-tagging;
}
lo0 {
unit 0;
}
}

[edit]

=======================

Thanks.

Kind regards
Leo Gu

koala0808

I think this issue is due to the command "ldp-tunneling".
When I delete/deactive "ldp-tunneling" on r3, the hidden routes within inet.3 routing table of r3 are gone.

PS: the same situation are the same on r4.

========================
[edit]
root@test# show logical-routers r3 protocols mpls
inactive: no-propagate-ttl;
label-switched-path r3->r4 {
from 3.3.3.3;
to 4.4.4.4;
ldp-tunneling;
adaptive;
primary r3r4;
}
path r3r4 {
5.5.13.1 strict;
5.5.12.2 strict;
}
interface fxp2.13;
interface fxp1.35;
interface fxp1.36;
========================

========================
root@test# run show route hidden logical-router r3

inet.0: 21 destinations, 21 routes (21 active, 0 holddown, 0 hidden)

inet.3: 8 destinations, 12 routes (5 active, 0 holddown, 6 hidden)
+ = Active Route, - = Last Active, * = Both

4.4.4.4/32 [OSPF] 00:00:13, metric 3
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4
5.5.47.0/24 [OSPF] 00:00:13, metric 4
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4
5.5.48.0/24 [OSPF] 00:00:13, metric 4
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4
5.5.78.0/24 [OSPF] 00:00:13, metric 5
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4
7.7.7.7/32 [OSPF] 00:00:13, metric 4
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4
8.8.8.8/32 [OSPF] 00:00:13, metric 4
> to 5.5.13.1 via fxp2.13, label-switched-path r3->r4

mpls.0: 10 destinations, 10 routes (10 active, 0 holddown, 0 hidden)
========================

========================
[edit]
root@test# show logical-routers r3 protocols mpls
inactive: no-propagate-ttl;
label-switched-path r3->r4 {
from 3.3.3.3;
to 4.4.4.4;
inactive: ldp-tunneling;
adaptive;
primary r3r4;
}
path r3r4 {
5.5.13.1 strict;
5.5.12.2 strict;
}
interface fxp2.13;
interface fxp1.35;
interface fxp1.36;
========================

========================
[edit]
root@test# run show route hidden logical-router r3

inet.0: 21 destinations, 21 routes (21 active, 0 holddown, 0 hidden)

inet.3: 3 destinations, 3 routes (3 active, 0 holddown, 0 hidden)

mpls.0: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden)
========================

Thanks.

Kind regards
Leo Gu

Aldur

It's been a while since I've done LDP tunneling but I think I ran into a similar issue a while back. If I recall correctly the routes were being hidden that I wanted to use for LDP tunneling because LDP didn't see it as the shortest path, as the IGP was reporting to it.

I don't know if this is the same situation as yours, but just might be