In Mixed VCP between QFX5100 or EX4600 and EX4300 environment, 10G DAC (740-030076) VCP may not come up after upgrading from 18.4 to 20.X.
After Virtual chassis devices come up, VCP may fail coming up.
root@switch> show virtual-chassis protocol adjacency fpc0: -------------------------------------------------------------------------- Interface System State Hold (secs) vcp-255/0/46.32768 c042.d013.86e0 Initializing 59 <<<<<<<<<<<<<<<<<<<<<<<<< Here!! vcp-255/0/47.32768 c042.d013.dcc0 Up 59 fpc1: -------------------------------------------------------------------------- Interface System State Hold (secs) vcp-255/2/0.32768 c042.d013.dcc0 Up 59 <<<<<<<<<<<<<<<<<<<<<<<<< Missing vcp-255/2/1 fpc2: -------------------------------------------------------------------------- Interface System State Hold (secs) vcp-255/2/0.32768 d007.ca58.54a0 Up 58 vcp-255/2/1.32768 c042.d013.86e0 Up 57 {master:0} root@switch> show virtual-chassis Virtual Chassis ID: e7f4.16a5.b235 Virtual Chassis Mode: Mixed Mstr Mixed Route Neighbor List Member ID Status Serial No Model prio Role Mode Mode ID Interface 0 (FPC 0) Prsnt TA37173XXXXX qfx5100-48s-6q 128 Master* Y VC 2 vcp-255/0/47 1 (FPC 1) Prsnt PD37170XXXXX ex4300-48p 128 Linecard Y VC 2 vcp-255/2/0 2 (FPC 2) Prsnt PD37170XXXXX ex4300-48p 128 Linecard Y VC 0 vcp-255/2/0 1 vcp-255/2/1 Member ID for next new member: 3 (FPC 3) {master:0} root@switch> show virtual-chassis vc-port fpc0: -------------------------------------------------------------------------- Interface Type Trunk Status Speed Neighbor or ID (mbps) ID Interface PIC / Port 0/46 Configured -1 Up 10000 <<<<<<<<<<<<<<<<<<<<<<<<< No neighbor 0/47 Configured -1 Up 10000 2 vcp-255/2/0 fpc1: -------------------------------------------------------------------------- Interface Type Trunk Status Speed Neighbor or ID (mbps) ID Interface PIC / Port 2/0 Configured -1 Up 10000 2 vcp-255/2/1 2/1 Configured -1 Up 10000 <<<<<<<<<<<<<<<<<<<<<<<<< No neighbor 1/3 Configured Absent fpc2: -------------------------------------------------------------------------- Interface Type Trunk Status Speed Neighbor or ID (mbps) ID Interface PIC / Port 2/0 Configured -1 Up 10000 0 vcp-255/0/47 2/1 Configured -1 Up 10000 1 vcp-255/2/0 1/1 Configured Absent 1/0 Configured Absent 1/2 Configured Absent 1/3 Configured Absent {master:0} root@switch>
This has been fixed by PR1665250. Refer to the following link.https://prsearch.juniper.net/InfoCenter/index?page=prcontent&id=PR1665250As a recovery way, delete and re-add EX or QFX device corresponding port from VCP as follows.For example, assume that VCP 255/2/1 on member 1 failed coming up. Also, you may need to do the same on the opposite link as well.
root@switch> request virtual-chassis vc-port delete pic-slot 2 port 1 member 1 root@switch> request virtual-chassis vc-port set pic-slot 2 port 1 member 1