7206VXR NPE-G2 Hung

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Sep 9th, 2009
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Hello :


My customer saw 7206VXR router was hung and no console access is possible . In order back up the service they had to reboot the router . And after that router works fine .


From the show tech I see the there is a crashinfo file .


In that I see following msgs ;


Writing crashinfo to bootflash:crashinfo_20090907-0847247 04:47:33: %VPN_HW-1-PACKET_ERROR: slot: 1 Packet Encryption/Decryption error, Output Authentication error:srcadr=172.17.254.1,dstadr=172.17.254.2,size=1512,handle=0x5D9D

Sep 7 04:47:33: %CRYPTO-4-RECVD_PKT_MAC_ERR: decrypt: mac verify failed for connection id=3437 local=172.17.254.2 remote=172.17.254.1 spi=05DF1258 seqno=00169F94

Sep 7 04:50:20: %VPN_HW-1-PACKET_ERROR: slot: 1 Packet Encryption/Decryption error, Output Authentication error:srcadr=172.17.254.1,dstadr=172.17.254.2,size=1512,handle=0x5D9D

Sep 7 04:50:20: %CRYPTO-4-RECVD_PKT_MAC_ERR: decrypt: mac verify failed for connection id=3437 local=172.17.254.2 remote=172.17.254.1 spi=05DF1258 seqno=0


Also there was a high CPU load whether average utlization was 100%.


Six months ago they see they were getting

%VPN_HW-1-PACKET_ERROR: slot: 1 Packet Encryption msgs and they had replaced the SA-VAM2+ card . But I am not sure whether this crash is something replated to %VPN_HW-1-PACKET_ERROR: msgs .


Router : 7206VXR NPE-G2

IOS : 12.4(20)T


Regards

Arjun




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sampusarkar Wed, 09/09/2009 - 01:13
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Got the following bug . Again not sure .


CSCsr65069 Bug Details Bug #3 of 3 | < Previous | Next >


crash due to SYS-2-CHUNKBADMAGIC at chunk_free_caller

Symptoms: A router reports "%SYS-2-CHUNKBADMAGIC: Bad magic number in chunk

header" and reloads.


Conditions: This symptom is observed with Cisco routers that are running

Cisco IOS Release 12.4T under an increased traffic load.


Workaround: There are no known workarounds.


Further Problem Description: This issue is related to a classification engine

in Cisco IOS software. This engine is used by all features that require

classification (for example, QoS, NetFlow).


Giuseppe Larosa Wed, 09/09/2009 - 03:53
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Hello Ariujn,

in sh ver, sh stack or in the crashinfo file do you see the same sentence:


crash due to SYS-2-CHUNKBADMAGIC at chunk_free_caller


This is a symptom of this bug.


Is the router configured for Hierarchical QoS with NBAR and netflow?


have you got an ATM PA as in the related bug info section?


Hope to help

Giuseppe


sampusarkar Wed, 09/09/2009 - 05:54
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Hello Giuseppe :


Yes, they are using QoS with Netflow .

Also they have ATM PA installed in the chassis .



From the crashinfo file :---



Sep 7 11:46:16: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 10.80.186.2 (ATM2/0.111) is up: new adjacency

Sep 7 11:47:19: %SYS-2-CHUNKBADMAGIC: Bad magic number in chunk header, chunk 794AFBC data B0D0B0D chunkmagic 0 chunk_freemagic 0 -Process= "", ipl= 4, -Traceback= 0x17A4C0C 0xBEDA4C 0xBEB60C 0x2BA6364 0xE0D76C 0x221914 0x221ACC 0x223C80 0x225C50 0x11DAA70 0x11D7D50 0x11D677C 0x11D5608

chunk_diagnose, code = 1

chunk name is CCE dp feature


current chunk header = 0x0B0D0AFD

data check, ptr = 0x0B0D0B0D


next chunk header = 0x0B0D0B3D

data check, ptr = 0x0B0D0B4D


previous chunk header = 0x0B0D0ABD

data check, ptr = 0x0B0D0ACD


--------------------


PA-A6-E3= they use this ATM card .


Please suggest whether this is the correct bug .


Regards

Arjun


Giuseppe Larosa Wed, 09/09/2009 - 07:49
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Hello Arjun,

I think the bug applies to your case.


Try to load IOS image 12.4(20)T3 or newer where the problem should be fixed.


Hope to help

Giuseppe


sampusarkar Wed, 09/09/2009 - 08:04
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Hello Giuseppe :


Thanks for the confirmation . But I also concern about the nVPN encryption error msgs which are still showing up in the router console .


As per Cisco if these error msgs are intrmittent then we need to replace VAM card . They had replaced the card but still they get these error msgs . So my question is the whether the IOS upgrade will solve (%VPN_HW-1-PACKET_ERROR) issue.


Regards

Arjun

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