Enabling Ultimate-Hop-Popping (UHP) on ACX7024 and ACX7100-48L, LSP goes down
Topology: ACX7024<>ACX7100-32C<>ACX7100-48L
###UHP has been disabled here, LSP is UP##
l2circuit {
neighbor 2.2.2.2 {
interface et-0/0/2.0 {
virtual-circuit-id 1;
}
ldp {
interface lo0.0;
mpls {
statistics {
file mpls_statistics size 100m files 10;
interval 30;
auto-bandwidth;
optimize-timer 300;
exclude-srlg;
inactive: ultimate-hop-popping;
label-switched-path TO-ACX7100-48L-FROM-ACX7024-01 {
to 2.2.2.2;
inactive: no-self-ping;
link-protection;
interface et-0/0/0.0;
interface et-0/0/1.0;
root@acx7024# run show mpls lsp ingress brief
Jul 22 16:55:48
Ingress LSP: 1 sessions
To From State Rt P ActivePath LSPname
2.2.2.2 3.3.3.3 Up 0 * TO-ACX7100-48L-FROM-ACX7024-01
Total 1 displayed, Up 1, Down 0
root@acx7024# run show rsvp session name TO-ACX7100-48L-FROM-ACX7024-01
Jul 22 16:55:49
Ingress RSVP: 3 sessions
To From State Rt Style Labelin Labelout LSPname
2.2.2.2 3.3.3.3 Up 0 1 SE - 38 TO-ACX7100-48L-FROM-ACX7024-01
Egress RSVP: 2 sessions
Total 0 displayed, Up 0, Down 0
Transit RSVP: 0 sessions
##Cleared the LSP ##
root@acx7024# run clear mpls lsp name TO-ACX7100-48L-FROM-ACX7024-01
Jul 22 16:56:43
[edit]
Jul 22 16:56:50
192.168.1.2 S 192.168.4.1 S
Received RRO (ProtectionFlag 1=Available 2=InUse 4=B/W 8=Node 10=SoftPreempt 20=Node-ID):
1.1.1.1(flag=0x21) 192.168.1.2(flag=1 Label=36) 2.2.2.2(flag=0x20) 192.168.4.1(Label=3)
183 Jul 22 16:56:45.317 Link-protection Up
182 Jul 22 16:56:43.783 Record Route: 1.1.1.1(flag=0x21) 192.168.1.2(flag=1 Label=36) 2.2.2.2(flag=0x20) 192.168.4.1(Label=3)
181 Jul 22 16:56:43.515 Selected as active path
180 Jul 22 16:56:43.514 Self-ping ended successfully
179 Jul 22 16:56:43.108 Up
178 Jul 22 16:56:43.108 Self-ping started
177 Jul 22 16:56:43.108 Self-ping enqueued
176 Jul 22 16:56:43.108 Record Route: 1.1.1.1(flag=0x20) 192.168.1.2(Label=36) 2.2.2.2(flag=0x20) 192.168.4.1(Label=3)
175 Jul 22 16:56:43.055 LSP-ID: 15 created
174 Jul 22 16:56:43.055 Originate Call
173 Jul 22 16:56:43.055 CSPF: computation result accepted 192.168.1.2 192.168.4.1
172 Jul 22 16:56:43.055 Clear Call
171 Jul 22 16:56:43.054 Deselected as active
170 Jul 22 16:56:43.054 Link-protection Down
##Enabling UHP, clearing LSP session- LSP remains down##
root@acx7024# activate protocols mpls ultimate-hop-popping
Jul 22 16:58:44
root@acx7024# commit
Jul 22 16:58:46
commit complete
Jul 22 16:58:59
Jul 22 16:59:10
Jul 22 16:59:15
2.2.2.2 3.3.3.3 Dn 0 - TO-ACX7100-48L-FROM-ACX7024-01
Total 1 displayed, Up 0, Down 1
Jul 22 16:59:32
Jul 22 16:59:43
1.1.1.1(flag=0x21) 192.168.1.2(flag=1 Label=38) 2.2.2.2(flag=0x20) 192.168.4.1(Label=28)
203 Jul 22 16:59:10.784 Record Route: 1.1.1.1(flag=0x21) 192.168.1.2(flag=1 Label=38) 2.2.2.2(flag=0x20) 192.168.4.1(Label=28)
202 Jul 22 16:59:10.282 Up
201 Jul 22 16:59:10.282 Self-ping started
200 Jul 22 16:59:10.282 Self-ping enqueued
199 Jul 22 16:59:10.282 Record Route: 1.1.1.1(flag=0x20) 192.168.1.2(Label=38) 2.2.2.2(flag=0x20) 192.168.4.1(Label=28)
198 Jul 22 16:59:10.231 LSP-ID: 17 created
197 Jul 22 16:59:10.231 Originate Call
196 Jul 22 16:59:10.231 CSPF: computation result accepted 192.168.1.2 192.168.4.1
195 Jul 22 16:59:10.231 Self-ping ended due to LSP tear-down
194 Jul 22 16:59:10.230 Clear Call
193 Jul 22 16:59:10.230 Deselected as active
192 Jul 22 16:59:10.230 Link-protection Down
191 Jul 22 16:58:49.782 Record Route: 1.1.1.1(flag=0x21) 192.168.1.2(flag=1 Label=37) 2.2.2.2(flag=0x20) 192.168.3.1(Label=27)
190 Jul 22 16:58:49.510 Up
189 Jul 22 16:58:49.510 Self-ping started
188 Jul 22 16:58:49.510 Self-ping enqueued
187 Jul 22 16:58:49.510 Record Route: 1.1.1.1(flag=0x20) 192.168.1.2(Label=37) 2.2.2.2(flag=0x20) 192.168.3.1(Label=27)
186 Jul 22 16:58:49.497 LSP-ID: 16 created
185 Jul 22 16:58:49.497 Originate make-before-break call
184 Jul 22 16:58:49.497 CSPF: computation result accepted 192.168.1.2 192.168.3.1
LSP goes down if UHP is configured
All ACX (Junos+EVO) does not support Ultimate hop popping feature as confirmed under PR1825470.
There is also no future scope for this feature implementation.