Symptom
Router crash when changing the encapsulation over a PPPOE session on the peer device.
Conditions
Router crashed after changing encapsulation on peer router with one pppoe session.
For example:
----------------
**Router1 has an active PPPOE session with Router2.
Router1#sh pppoe session
1 client session
Uniq ID PPPoE RemMAC Port VT VA State
SID LocMAC VA-st Type
N/A 36 d48c.XXXX.XXXX Gi0/0/0.101 Di1 Vi2 UP
a023.XXXX.XXXX VLAN: 101 UP
Router2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router2(config)#interface GigabitEthernet0/0.101
Router2(config-subif)#enca
Router2(config-subif)#encapsulation do
Router2(config-subif)#encapsulation dot1Q 110 --------->Changing encapsulation on peer
Router1# -------------->Observing Crash on Router1 after changing encapsulation on peer router (Router2)
Exception to IOS Thread:
Frame pointer 0x7F44614B50, PC = 0xF57E60
UNIX-EXT-SIGNAL: Segmentation fault(11), Process = PPPoE Discovery Daemon
-Traceback= 1#12d8555867a09aab907fdf349823dbee iosd_crankshaft_unix:7F68490000+34F44 linux-vdso:7F7ADE1000+510 :400000+B57E60 :400000+B3A270 :400000+221F048 :400000+2211C94 :400000+22123B0 :400000+43FD3F8
