I am running vpp v20.01-release on Ubuntu 18.04 on an Azure VM. I had been 
forwarding traffic with VPP for about 5 days and today I noticed that my 2 main 
interfaces FailsafeEthernet2 and FailsafeEthernet4) had gone down and I could 
not find a reason. I looked at the journalctl logs (which only go back about 6 
hours and the interfaces went down about 18 hours ago), dmesg logs, and ran a 
few commands in vppctl to no avail.

I was able to restore the interfaces just by setting their state back to 'up'.

vpp# show int
Name               Idx    State  MTU (L3/IP4/IP6/MPLS)     Counter          
Count
FailsafeEthernet2                 1      up          9000/0/0/0     rx packets  
                 972
rx bytes                   72060
tx packets               1435428
tx bytes                94738701
drops                        972
ip4                          956
ip6                           15
FailsafeEthernet4                 2      up          9000/0/0/0     rx packets  
             1435458
rx bytes                94741057
drops                         31
ip4                      1435430
ip6                           28

I did, however, notice that I have more Linux network interfaces than I 
expected:
ifconfig
dtap2: flags=4675<UP,BROADCAST,RUNNING,ALLMULTI,MULTICAST>  mtu 1500
inet6 fe80::20d:3aff:feff:1b82  prefixlen 64  scopeid 0x20<link>
ether 00:0d:3a:ff:1b:82  txqueuelen 1000  (Ethernet)
RX packets 2012647  bytes 2878934474 (2.8 GB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 24822  bytes 1839632 (1.8 MB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

dtap3: flags=4675<UP,BROADCAST,RUNNING,ALLMULTI,MULTICAST>  mtu 1500
inet6 fe80::20d:3aff:fe84:aa4f  prefixlen 64  scopeid 0x20<link>
ether 00:0d:3a:84:aa:4f  txqueuelen 1000  (Ethernet)
RX packets 0  bytes 0 (0.0 B)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 1692203  bytes 2362194140 (2.3 GB)
TX errors 0  dropped 1096 overruns 0  carrier 0  collisions 0

dtap4: flags=4675<UP,BROADCAST,RUNNING,ALLMULTI,MULTICAST>  mtu 1500
inet6 fe80::20d:3aff:feff:1b82  prefixlen 64  scopeid 0x20<link>
ether 00:0d:3a:ff:1b:82  txqueuelen 1000  (Ethernet)
RX packets 0  bytes 0 (0.0 B)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 1527  bytes 113126 (113.1 KB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

dtap5: flags=4675<UP,BROADCAST,RUNNING,ALLMULTI,MULTICAST>  mtu 1500
inet6 fe80::20d:3aff:fe84:aa4f  prefixlen 64  scopeid 0x20<link>
ether 00:0d:3a:84:aa:4f  txqueuelen 1000  (Ethernet)
RX packets 0  bytes 0 (0.0 B)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 7164  bytes 6532230 (6.5 MB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

dtap8: flags=4675<UP,BROADCAST,RUNNING,ALLMULTI,MULTICAST>  mtu 1500
inet6 fe80::20d:3aff:feff:1b82  prefixlen 64  scopeid 0x20<link>
ether 00:0d:3a:ff:1b:82  txqueuelen 1000  (Ethernet)
RX packets 0  bytes 0 (0.0 B)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 1101  bytes 81606 (81.6 KB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

dtap9: flags=4675<UP,BROADCAST,RUNNING,ALLMULTI,MULTICAST>  mtu 1500
inet6 fe80::20d:3aff:fe84:aa4f  prefixlen 64  scopeid 0x20<link>
ether 00:0d:3a:84:aa:4f  txqueuelen 1000  (Ethernet)
RX packets 0  bytes 0 (0.0 B)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 67  bytes 4834 (4.8 KB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
inet 10.0.9.4  netmask 255.255.255.0  broadcast 10.0.9.255
inet6 fe80::20d:3aff:feff:1a42  prefixlen 64  scopeid 0x20<link>
ether 00:0d:3a:ff:1a:42  txqueuelen 1000  (Ethernet)
RX packets 9860630  bytes 8395557697 (8.3 GB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 7300672  bytes 1643536351 (1.6 GB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth1: flags=4675<UP,BROADCAST,RUNNING,ALLMULTI,MULTICAST>  mtu 1500
inet 10.0.8.4  netmask 255.255.255.0  broadcast 10.0.8.255
inet6 fe80::20d:3aff:feff:1b82  prefixlen 64  scopeid 0x20<link>
ether 00:0d:3a:ff:1b:82  txqueuelen 1000  (Ethernet)
RX packets 45588  bytes 3379906 (3.3 MB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 2012803  bytes 2878946062 (2.8 GB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth2: flags=4675<UP,BROADCAST,RUNNING,ALLMULTI,MULTICAST>  mtu 1500
inet 10.0.10.4  netmask 255.255.255.0  broadcast 10.0.10.255
inet6 fe80::20d:3aff:fe84:aa4f  prefixlen 64  scopeid 0x20<link>
ether 00:0d:3a:84:aa:4f  txqueuelen 1000  (Ethernet)
RX packets 1651556  bytes 2368775116 (2.3 GB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 155  bytes 11518 (11.5 KB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
inet 127.0.0.1  netmask 255.0.0.0
inet6 ::1  prefixlen 128  scopeid 0x10<host>
loop  txqueuelen 1000  (Local Loopback)
RX packets 439044  bytes 59701416 (59.7 MB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 439044  bytes 59701416 (59.7 MB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

rename11: flags=6723<UP,BROADCAST,RUNNING,ALLMULTI,SLAVE,MULTICAST>  mtu 1500
ether 00:0d:3a:ff:1b:82  txqueuelen 1000  (Ethernet)
RX packets 2  bytes 180 (180.0 B)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 114841  bytes 163438128 (163.4 MB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

rename12: flags=6723<UP,BROADCAST,RUNNING,ALLMULTI,SLAVE,MULTICAST>  mtu 1500
ether 00:0d:3a:84:aa:4f  txqueuelen 1000  (Ethernet)
RX packets 53463  bytes 76829988 (76.8 MB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 120  bytes 8400 (8.4 KB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I am surprised there are so many dtap interfaces. I was expecting only 2 of 
them.

Any suggestions for why my interfaces went down or what I can do to 
troubleshoot or prevent this?

Thanks!
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