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Knowledge Base

S9300 switch board TCAM failure caused interface traffic flooding failure

Publication Date:  2019-07-23  |   Views:  201  |   Downloads:  0  |   Author:  c00222574  |   Document ID:  EKB1000019808

Contents

Issue Description

S9312 interface traffic is abnormal, the traffic of inbound and outbound is discrepany for hundredfold. traffic will be interrupted when night pinnacle.

display interface GigabitEthernet 1/0/21
GigabitEthernet1/0/21 current state : UP
Description:BAS-E320-2.MAN G13/0/2 For:IAD
Switch Port,PVID : 1,The Maximum Frame Length is 9216
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is x-x-6e7c
Port Mode: COMMON FIBER
Speed : 1000, Loopback: NONE
Duplex: FULL, Negotiation: DISABLE
Mdi : NORMAL
Last 300 seconds input rate 177576 bits/sec, 93 packets/sec
Last 300 seconds output rate 294858824 bits/sec, 56684 packets/sec


Alarm Information

It found the following information by login device:
Oct 31 2011 10:54:20 TZ-LQ-SongTang-S9312-1.MAN %%01SDKE/3/ERR(D):-Slot=9; Slot 9 layer DRV module AV level ERR:
bm_mac_add_dynamic_mac_addr:soc_mem_generic_insert EXT_L2_ENTRYm rv=-11. Oct 31 2011 10:54:20 TZ-LQ-SongTang-S9312-1.MAN %%01SDKE/3/ERR(D):-Slot=9; Slot 9 layer DRV module AV level ERR:
DRV_MAC_AddDynamicMacAddr:LSW_MAC_ADD_DYNAMIC_MAC_ADDR ulRet=0x1.
Oct 31 2011 10:54:20 TZ-LQ-SongTang-S9312-1.MAN %%01SDKE/3/ERR(D):-Slot=9; Slot 9 layer DRV module AV level ERR:
bm_mac_add_dynamic_mac_addr:soc_mem_generic_insert EXT_L2_ENTRYm rv=-11.
Oct 31 2011 10:54:20 TZ-LQ-SongTang-S9312-1.MAN %%01SDKE/3/ERR(D):-Slot=9; Slot 9 layer DRV module AV level ERR:
DRV_MAC_AddDynamicMacAddr:LSW_MAC_ADD_DYNAMIC_MAC_ADDR ulRet=0x1.
Oct 31 2011 10:54:20 TZ-LQ-SongTang-S9312-1.MAN %%01SDKE/3/ERR(D):-Slot=9; Slot 9 layer DRV module AV level ERR:
bm_mac_add_dynamic_mac_addr:soc_mem_generic_insert EXT_L2_ENTRYm rv=-11.
Oct 31 2011 10:54:20 TZ-LQ-SongTang-S9312-1.MAN %%01SDKE/3/ERR(D):-Slot=9; Slot 9 layer DRV module AV level ERR:
DRV_MAC_AddDynamicMacAddr:LSW_MAC_ADD_DYNAMIC_MAC_ADDR ulRet=0x1.
Oct 31 2011 10:54:20 TZ-LQ-SongTang-S9312-1.MAN %%01SDKE/3/ERR(D):-Slot=9; Slot 9 layer DRV module AV level ERR:
bm_mac_add_dynamic_mac_addr:soc_mem_generic_insert EXT_L2_ENTRYm rv=-11.
Oct 31 2011 10:54:20 TZ-LQ-SongTang-S9312-1.MAN %%01SDKE/3/ERR(D):-Slot=9; Slot 9 layer DRV module AV level ERR:
DRV_MAC_AddDynamicMacAddr:LSW_MAC_ADD_DYNAMIC_MAC_ADDR ulRet=0x1.

Handling Process

Solution:

1. close tcam temporarily to avoid the problem.

Use the following command:
assign resource-mode 0 slot 9
reset slot 9 //it need to reset slot 9, it will be effective.

2.Change slot 9 board.

Root Cause

by above log information, it found that slot 9 board tcam hardware visiting failure.

query the mac that does not accept other board synchronized, that caused traffic broadcast.
[S9312-1.MAN]disp mac-address summary
----------------------------------------------------------------
Slot Total Blackhole Static Dynamic DLocal DRemote
----------------------------------------------------------------
1 8667 0 0 8667 448 8219
3 7835 0 0 7835 231 7604
5 8568 0 0 8568 1970 6598
6 5762 0 0 5762 39 5723
7 7616 0 0 7616 1926 5690
9 5021 0 0 5021 5021 0 //slot 9 did not accept other board synchronous mac
11 7837 0 0 7837 0 7837
12 0 0 0 0 0 0
----------------------------------------------------------------

Suggestions

S9300 switch interface traffic abnormal, it can query whether the board is tcam failure that cause mac learning abnormal and packet broadcast.
S9300 layer 2 forwarding find mac table for one time on inbound interface board, the traffic sent by G1/0/21 interface is coming from SLOT9 flooding traffic by packet getting analysis.