It is seen that after a system or a FPC reload that PPPoE subscribers will fail to log back in.
This issue is very specific to the following.
1) PWHT PPPoE clients
2) LT anchor interface resides on a MPC2NG flex Q card
3) LT interface configuration is missing the "hierarchical-scheduler maximum-hierarchy-levels 2"
4) Chassis config missing "flexible-queuing-mode"
Specifics:
FPC 2 REV 11 750-054904 CAEN0675 MPC2E NG PQ & Flex Q
labroot@medford-re0# run show configuration chassis | display set
set chassis pseudowire-service device-count 8000
set chassis fpc 2 pic 0 tunnel-services bandwidth 10g
set chassis fpc 2 pic 0 inline-services bandwidth 10g
set chassis fpc 2 pic 1 tunnel-services
set chassis fpc 2 pic 1 inline-services bandwidth 10g
set chassis fpc 2 flexible-queuing-mode ******This is required. If missing issue will be seen if FPC2 reloads.
set chassis network-services enhanced-ip
Lt- Interface config
labroot@medford-re0# run show configuration interfaces lt-2/0/0
hierarchical-scheduler maximum-hierarchy-levels 2; *****This is required. If missing from configuration issue will be seen.
PSX interface configuration
set interfaces ps1122 anchor-point lt-2/0/0
set interfaces ps1122 flexible-vlan-tagging
set interfaces ps1122 auto-configure stacked-vlan-ranges dynamic-profile SVLAN_PROFILE accept pppoe
set interfaces ps1122 auto-configure stacked-vlan-ranges dynamic-profile SVLAN_PROFILE ranges any,any
set interfaces ps1122 auto-configure remove-when-no-subscribers
set interfaces ps1122 esi 00:11:11:11:11:11:11:11:11:22
set interfaces ps1122 esi single-active
set interfaces ps1122 unit 0 encapsulation ethernet-ccc
The MX will show RX PADI and TX PADO but the PADO is not seen at the CPE resulting in retries:
Example: System show's that the PADO is generatated but never seen on the wire. Also, lt interface is show no TX/RX labroot@medford-re0> show pppoe statistics Active PPPoE sessions: 0 PacketType Sent Received PADI 0 1 PADO 1 0 PADR 0 0 PADS 0 0 PADT 0 0 Service name error 0 0 AC system error 0 0 Generic error 0 0 Malformed packets 0 0 Unknown packets 0 0 labroot@medford-re0> show pppoe statistics Active PPPoE sessions: 0 PacketType Sent Received PADI 0 2 PADO 2 0 PADR 0 0 PADS 0 0 PADT 0 0 Service name error 0 0 AC system error 0 0 Generic error 0 0 Malformed packets 0 0 Unknown packets 0 0 Lt interface stats show all "0" Logical interface lt-2/0/0.32767 (Index 341) (SNMP ifIndex 21484) (Generation 157) Egress queues: 8 supported, 4 in use Queue counters: Queued packets Transmitted packets Dropped packets 0 0 0 0 1 0 0 0 2 0 0 0 3 0 0 0 Flags: Up SNMP-Traps 0x4000 VLAN-Tag [ 0x0000.0 ] Encapsulation: ENET2 Traffic statistics: Input bytes : 0 Output bytes : 0 Input packets: 0 Output packets: 0 Local statistics: Input bytes : 0 Output bytes : 0 Input packets: 0 Output packets: 0 Transit statistics: Input bytes : 0 0 bps Output bytes : 0 0 bps Input packets: 0 0 pps Output packets: 0 0 pps
Having a MPC2E NG PQ & Flex Q the following configuration statements are required even when COS is NOT used for these clients.
set chassis fpc<x> flexible-queuing-mode
set interfaces lt-x/x/x hierarchical-scheduler maximum-hierarchy-levels 2