This article explains why VT IFD/IFL is created and logical unit changes each time the VT interface is created.
- VT IFD is created when the tunnel service is enabled.
labroot@R1_re0> show configuration chassis
fpc 0 {
pic 0 {
tunnel-services;
}
labroot@R1_re0> show interfaces terse vt*
Interface Admin Link Proto Local Remote
vt-0/0/0 up up
vt-0/0/1 up up
vt-0/0/2 up up
vt-0/0/3 up up
- RSVP creates VT ifl by default, if tunnel service is enabled.
labroot@R1_re0# show protocols rsvp
interface et-0/0/0.0;
labroot@R1_re0# run show interfaces terse vt*
vt-0/0/0.2097155 up up inet
mpls
vt-0/0/1.2097154 up up inet
vt-0/0/2.2097153 up up inet
vt-0/0/3.2097152 up up inet
- Deactivate/activate RSVP would recreate VT IFLs, and these logical units are assigned sequentially each time the VT interface is recreated.
Sep 5 20:03:20.288 R1_re mgd[32206]: UI_CMDLINE_READ_LINE: User 'labroot', command 'set protocols rsvp interface et-0/0/0 '
Sep 5 20:03:21.750 R1_re mgd[32206]: UI_CMDLINE_READ_LINE: User 'labroot', command 'commit '
Sep 5 20:03:53.360 R1_re mib2d[18969]: SNMP_TRAP_LINK_UP: ifIndex 780, ifAdminStatus up(1), ifOperStatus up(1), ifName vt-0/0/3.2097152
Sep 5 20:03:53.361 R1_re mib2d[18969]: SNMP_TRAP_LINK_UP: ifIndex 781, ifAdminStatus up(1), ifOperStatus up(1), ifName vt-0/0/2.2097153
Sep 5 20:03:53.361 R1_re mib2d[18969]: SNMP_TRAP_LINK_UP: ifIndex 782, ifAdminStatus up(1), ifOperStatus up(1), ifName vt-0/0/1.2097154
Sep 5 20:03:53.361 R1_re mib2d[18969]: SNMP_TRAP_LINK_UP: ifIndex 783, ifAdminStatus up(1), ifOperStatus up(1), ifName vt-0/0/0.2097155
Sep 5 20:18:13.382 R1_re mgd[32206]: UI_CMDLINE_READ_LINE: User 'labroot', command 'deactivate protocols rsvp '
Sep 5 20:18:13.976 R1_re mgd[32206]: UI_CMDLINE_READ_LINE: User 'labroot', command 'commit '
Sep 5 20:18:15.761 R1_re mib2d[18969]: SNMP_TRAP_LINK_DOWN: ifIndex 783, ifAdminStatus down(2), ifOperStatus down(2), ifName vt-0/0/0.2097155
Sep 5 20:18:15.761 R1_re mib2d[18969]: SNMP_TRAP_LINK_DOWN: ifIndex 782, ifAdminStatus down(2), ifOperStatus down(2), ifName vt-0/0/1.2097154
Sep 5 20:18:15.761 R1_re mib2d[18969]: SNMP_TRAP_LINK_DOWN: ifIndex 781, ifAdminStatus down(2), ifOperStatus down(2), ifName vt-0/0/2.2097153
Sep 5 20:18:15.761 R1_re mib2d[18969]: SNMP_TRAP_LINK_DOWN: ifIndex 780, ifAdminStatus down(2), ifOperStatus down(2), ifName vt-0/0/3.2097152
Sep 5 20:18:20.391 R1_re mgd[32206]: UI_CMDLINE_READ_LINE: User 'labroot', command 'rollback 1 '
Sep 5 20:18:23.836 R1_re mgd[32206]: UI_CMDLINE_READ_LINE: User 'labroot', command 'commit '
Sep 5 20:18:53.360 R1_re mib2d[18969]: SNMP_TRAP_LINK_UP: ifIndex 780, ifAdminStatus up(1), ifOperStatus up(1), ifName vt-0/0/3.2097156
Sep 5 20:18:53.360 R1_re mib2d[18969]: SNMP_TRAP_LINK_UP: ifIndex 781, ifAdminStatus up(1), ifOperStatus up(1), ifName vt-0/0/2.2097157
Sep 5 20:18:53.361 R1_re mib2d[18969]: SNMP_TRAP_LINK_UP: ifIndex 782, ifAdminStatus up(1), ifOperStatus up(1), ifName vt-0/0/1.2097158
Sep 5 20:18:53.361 R1_re mib2d[18969]: SNMP_TRAP_LINK_UP: ifIndex 783, ifAdminStatus up(1), ifOperStatus up(1), ifName vt-0/0/0.2097159
It is expected behavior.