THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.
Revision | Publish Date | Comments |
---|---|---|
1.0 |
10-Nov-17 |
Initial Release |
Affected OS Type | Affected Release | Affected Release Number | Comments |
---|---|---|---|
NON-IOS |
3.18.1aSP, 3.18.1SP, 3.18.1S, 3.15.0S, 3.18.0SP, 3.17.0S, 3.18.0aS, 3.18.0S, 3.16.1S, 3.15.1S, 3.17.1S, 3.16.0S |
cBR-8 Cisco IOS XE Release: 3.18.2aSP / 15.6(2)SP2a has the fix as well as later releases. |
Defect ID | Headline |
---|---|
CSCvc32015 | SUP Crashed due to IPv6 list freed during v6list removing |
The cBR-8 Converged Broadband Router Supervisor card might crash due to memory corruption in the DHCPv6 (Dynamic Host Configuration Protocol version 6) client or DHCPv6 process under these circumstances:
When the IPv6 list is removed from the cable subscriber database, related to the DHCPv6 client in DHCPv6 solicit or DHCPv6 lease query response messages, the subscriber database entry is synchronized with the standby Supervisor and the cable line card.
If the process suspend occurs in this synchronization phase, under certain conditions such as at high CPU level, the IPv6 list might get freed elsewhere as a result of situations such as cable modem offline. When the process that uses this IPv6 list resumes, the freed IPv6 list is inadvertently accessed again which causes the Supervisor card to crash.
The issue can affect active and standy Supervisor cards.
Affected releases are listed in this table.
Impacted cBR-8 Release List |
---|
Cisco IOS® XE 3.15.0S / 15.5(2)S |
Cisco IOS XE 3.15.1S / 15.5(2)S1 |
Cisco IOS XE 3.16.0S / 15.5(3)S |
Cisco IOS XE 3.16.1S / 15.5(3)S1 |
Cisco IOS XE 3.16.2S / 15.5(3)S2 |
Cisco IOS XE 3.17.0S / 15.6(1)S |
Cisco IOS XE 3.17.1S / 15.6(1)S1 |
Cisco IOS XE 3.18.0S / 15.6(2)S |
Cisco IOS XE 3.18.0aS / 15.6(2)S0a |
Cisco IOS XE 3.18.1S / 15.6(2)S1 |
Cisco IOS XE 3.18.0SP / 15.6(2)SP |
Cisco IOS XE 3.18.1SP / 15.6(2)SP1 |
Cisco IOS XE 3.18.1aSP / 15.6(2)SP1a |
Note: cBR-8 Cisco IOS XE Releases 3.18.2aSP / 15.6(2)SP2a and later do not exhibit this issue.
A Supervisor card crash, with a segmentation fault at the DHCPv6 client process or DHCPv6 relay process, is reported in crashinfo with these messages:
UNIX-EXT-SIGNAL: Segmentation fault(11), Process = DHCPv6 client UNIX-EXT-SIGNAL: Segmentation fault(11), Process = DHCPv6 Relay
Cisco recommends that customers who use IPv6 features upgrade to Cisco IOS XE 3.18.2aSP or a later release that contains the fix. See this action table.
Impacted Release List | Recommended Action | Release Notes |
---|---|---|
Cisco IOS XE 3.15.0S / 15.5(2)S | Upgrade cBR-8 Cisco IOS XE to 3.18.2aSP / 15.6(2)SP2a or a later release | Release Notes for Cisco cBR Series Converged Broadband Routers for Cisco IOS-XE Release 3.18S - Caveat List |
Cisco IOS XE 3.15.1S / 15.5(2)S1 | ||
Cisco IOS XE 3.16.0S / 15.5(3)S | ||
Cisco IOS XE 3.16.1S / 15.5(3)S1 | ||
Cisco IOS XE 3.16.2S / 15.5(3)S2 | ||
Cisco IOS XE 3.17.0S / 15.6(1)S | ||
Cisco IOS XE 3.17.1S / 15.6(1)S1 | ||
Cisco IOS XE 3.18.0S / 15.6(2)S | ||
Cisco IOS XE 3.18.0aS / 15.6(2)S0a | ||
Cisco IOS XE 3.18.1S / 15.6(2)S1 | ||
Cisco IOS XE 3.18.0SP / 15.6(2)SP | ||
Cisco IOS XE 3.18.1SP / 15.6(2)SP1 | ||
Cisco IOS XE 3.18.1aSP / 15.6(2)SP1a | ||
Cisco IOS XE 3.18.2aSP / 15.6(2)SP2a or later | No action required | |
Cisco IOS XE 16.5.01SPa or later | No action required | Release Notes for Cisco cBR Series Converged Broadband Routers for Cisco IOS XE Everest 16.5.1 - Caveat List |
The show version CLI command displays the current software version that runs on the cBR-8 router, as shown in this example:
If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:
Cisco Notification Service—Set up a profile to receive email updates about reliability, safety, network security, and end-of-sale issues for the Cisco products you specify.