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NE40E Internet traffic lost caused by LPUA capacity fault

Publication Date:  2013-06-21 Views:  22 Downloads:  0
Issue Description
Customer had traffic losts in peak hour time.
Handling Process
[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
Check FIB capacity in device, it was found FIB capacity already exceeded, actually the board only support 400K FIB.
Solution
Aggregate parts of user routes, to control FIB account is in 300K or use more FIB capacity boards.
Suggestions
Use LPU boards, according specification.

END