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NE40E Internet traffic lost caused by LPUA capacity fault

Publication Date:  2012-07-27 Views:  45 Downloads:  0
Issue Description
Traffic losts in peak of traffic time on NE40E.

Alarm Information
[ORL011-NE40E-1]display alarm all
----------------------------------------------------------------------------
Index Level Date Time Info

1 Critical 11-11-25 21:20:18 The hardware resource(ID=33,User=FIBv4
) storage media of LPU5(Entity) exceed
ed the prealarm threshold
2 Critical 11-11-25 21:20:18 The hardware resource(ID=4,User=FIBv4)
storage media of LPU5(Entity) exceede
d the prealarm threshold
3 Critical 11-11-25 21:20:18 The hardware resource(ID=33,User=FIBv4
) storage media of LPU6(Entity) exceed
ed the prealarm threshold
4 Critical 11-11-25 21:20:18 The hardware resource(ID=4,User=FIBv4)
storage media of LPU6(Entity) exceede
d the prealarm threshold
5 Critical 11-11-25 21:20:18 The hardware resource(ID=33,User=FIBv4
) storage media of LPU2(Entity) exceed
ed the prealarm threshold
6 Critical 11-11-25 21:20:18 The hardware resource(ID=4,User=FIBv4)
storage media of LPU2(Entity) exceede
d the prealarm threshold
7 Critical 11-11-25 21:20:18 The hardware resource(ID=33,User=FIBv4
) storage media of LPU1(Entity) exceed
ed the prealarm threshold
8 Critical 11-11-25 21:20:18 The hardware resource(ID=33,User=FIBv4
) storage media of LPU3(Entity) exceed
ed the prealarm threshold
9 Critical 11-11-25 21:20:18 The hardware resource(ID=33,User=FIBv4
) storage media of LPU4(Entity) exceed
ed the prealarm threshold
10 Critical 11-11-25 21:20:18 The hardware resource(ID=4,User=FIBv4)
storage media of LPU1(Entity) exceede
d the prealarm threshold
11 Critical 11-11-25 21:20:18 The hardware resource(ID=4,User=FIBv4)
storage media of LPU3(Entity) exceede
d the prealarm threshold
12 Critical 11-11-25 21:20:18 The hardware resource(ID=4,User=FIBv4)
storage media of LPU4(Entity) exceede
d the prealarm threshold
----------------------------------------------------------------------------


Handling Process
Check FIB capacity in device, it was found FIB capacity already exceeded, actually the board only support 400K FIB.
[ORL011-NE40E-1]display fib statistics
Route Entry Count : 409719

[ORL011-NE40E-2]display fib statistics
Route Entry Count : 409340

[ORL011-NE40E-2-hidecmd]display tcam-config slot 3
Configuration mode [ MANUAL ] :
Configuration [ LPUA_TCAMA ] :
TableName Capacity StartAddr KeyLen ShareID ShareCapacity
-----------------------------------------------------------------------------
FIBV4 400 0xc000 72 4 400
DHCP 8 0x70000 144 5 16
ARPV4 16 0x8000 72 3 16
FIBV6 0 0x0 144 6 0
ARPV6 0 0x0 288 8 0
MFIBV4_DUMMY 1 0x70000 144 5 16
MFIBV6_DUMMY 0 0x0 288 8 0
Check 109.61.220.213 FIB entry in NE40E-1, it was found outbound interface is VLANIF998, membership interface only is GE3/0/0 in VLAN998. Check 109.61.220.213 FIB entry in slot 3, it was absent.
[ORL011-NE40E-1]dis fib 109.61.220.213
Route Entry Count: 1
Destination/Mask Nexthop Flag TimeStamp Interface TunnelID
109.61.220.213/32 95.107.47.58 DGHU t[13356349] Vlanif998 0x0


[ORL011-NE40E-1]display vlan 998
VLAN ID Type Status MAC Learning Broadcast/Multicast/Unicast Property
--------------------------------------------------------------------------------
998 common enable enable forward forward forward default
----------------
Tagged Port: GigabitEthernet3/0/0
----------------
Interface Physical
GigabitEthernet3/0/0 UP

[ORL011-NE40E-1]dis fib 3 109.61.220.213
Route Entry Count: 1
Destination/Mask Nexthop Flag TimeStamp Interface TunnelID
109.61.128.0/17 0.0.0.0 BSU t[13298378] NULL0 0x0
Check 109.61.220.213 FIB entry in NE40E-2, outbound interface is on slot 5, such FIB info exist in slot 5, but inter-connection slot 3 has no such info with NE40E-1:
[ORL011-NE40E-2]dis fib 109.61.220.213
Route Entry Count: 1
Destination/Mask Nexthop Flag TimeStamp Interface TunnelID
109.61.220.213/32 95.107.47.94 DGHU t[13358434] GE5/0/0.173 0x0

[ORL011-NE40E-2]dis fib 5 109.61.220.213
Route Entry Count: 1
Destination/Mask Nexthop Flag TimeStamp Interface TunnelID
109.61.220.213/32 95.107.47.94 DGHU t[13358434] GE5/0/0.173 0x0

[ORL011-NE40E-1]dis fib 3 109.61.220.213
Route Entry Count: 1
Destination/Mask Nexthop Flag TimeStamp Interface TunnelID
109.61.128.0/17 0.0.0.0 BSU t[13298378] NULL0 0x0
Therefrom:
When NE40E-2 ping 109.61.220.213, after packets sent, received ICMP response from slot 5, it’s no problem.
When NE40E-1 ping 109.61.220.213, after packets sent, packets arrived GE3/0/0 of NE40E-1, packets will search FIB for forwarding, but failed, packets were dropped, caused NE40E-1 cannot ping 109.61.220.213.

Root Cause
LPUA boards is using in a current network. FIB capacity of LPUA board is 400K. When service is in peak time, FIB capacity will exceed, parts of user route are absent in FIB, so cannot access Internet.

Suggestions
Aggregate parts of user routes, to control FIB account is in 300K or use more FIB capacity boards.

END