The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
These release notes describe the following topics:
This section lists the new hardware and software features supported by Cisco IOS Release 15.2S and contains the following subsections:
There are no new hardware features in Cisco IOS Release 15.2(4)S6.
There are no new software features in Cisco IOS Release 15.2(4)S6.
There are no new hardware features in Cisco IOS Release 15.2(4)S5.
There are no new software features in Cisco IOS Release 15.2(4)S5.
There are no new hardware features in Cisco IOS Release 15.2(4)S4.
There are no new software features in Cisco IOS Release 15.2(4)S4.
There are no new hardware features in Cisco IOS Release 15.2(4)S3.
There are no new software features in Cisco IOS Release 15.2(4)S3.
This section describes new and changed features in Cisco IOS Release 15.2(4)S2. Some features may be new to Cisco IOS Release 15.2(4)S2 but were released in earlier Cisco IOS software releases. Some features may have been released in earlier Cisco IOS software releases and have been changed in Cisco IOS Release 15.2(4)S2. To determine if a feature is new or changed, see the feature information table at the end of the feature module for that feature. Links to feature modules are included. If a feature does not have a link to a feature module, that feature is documented only in the release notes, and information about whether the feature is new or changed will be available in the feature description provided.
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/routers/7600/Hardware/Chassis_Installation/7600_Series_Router_Installation_Guide/osr_over.html
For detailed information about this feature, see the documents at the following URLs:
http://www.cisco.com/en/US/docs/routers/7600/Hardware/15_0s/7600_hwd.html
http://www.cisco.com/en/US/docs/routers/7600/Hardware/Hardware_Guides/7600_Series_Router_Module_Guide/asasm.html
There are no new software features in Cisco IOS Release 15.2(4)S2.
There are no new hardware features in Cisco IOS Release 15.2(4)S1.
There are no new software features in Cisco IOS Release 15.2(4)S1.
This section describes new and changed features in Cisco IOS Release 15.2(4)S. Some features may be new to Cisco IOS Release 15.2(4)S but were released in earlier Cisco IOS software releases. Some features may have been released in earlier Cisco IOS software releases and have been changed in Cisco IOS Release 15.2(4)S. To determine if a feature is new or changed, see the feature information table at the end of the feature module for that feature. Links to feature modules are included. If a feature does not have a link to a feature module, that feature is documented only in the release notes, and information about whether the feature is new or changed will be available in the feature description provided.
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/routers/7600/Hardware/Module_and_Line_Card_Installation_Guides/ES40_Line_Card_Installation_Guide/es40_hw_install_guide.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/interfaces_modules/shared_port_adapters/configuration/7600series/76_4xt.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/chassis/configuration/guide/sw_T1-E1.html
This section describes new and changed features in Cisco IOS Release 15.2(4)S. Some features may be new to Cisco IOS Release 15.2(4)S but were released in earlier Cisco IOS software releases. Some features may have been released in earlier Cisco IOS software releases and have been changed in Cisco IOS Release 15.2(4)S. Links to feature modules are included. If a feature listed does not have a link to a feature module, that feature is documented only in the release notes, and information about whether the feature is new or changed will be available in the feature description provided.
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/sw6vpe.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/chassis/configuration/guide/swbfd.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/irg-multihop-cbit.html
For detailed information about this feature, see the document at the following URLs:
http://www.cisco.com/en/US/docs/ios/iproute_bfd/configuration/guide/irb_bfd.html
http://www.cisco.com/en/US/docs/routers/7600/install_config/ES40_config_guide/es40_chap4.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bfd/configuration/15-2s/irb-bfd-shop-auth.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/
irg-additional-paths.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/irg-attribute-filter.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/irg_diverse_path.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/irg-grace-shut.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/irg-neighor.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/irg_ipv6_pic_edge.
html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/irg-mvpn-safi.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/
irg-mvpn-safi-ipv6.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/irg-origin-as.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-1sg/
irg-grace-restart-neighbor.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/irg-rt-filter.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-1sg/irg-4byte-asn.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-1sg/irg-dual-as.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/irg-prefix-export.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/
irg-unif-mpls-ibgp.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/swmp_transport_profile.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/chassis/configuration/guide/swpseudowire.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-2s/irg-mibv2.html
For detailed information about this feature, see the document at the following URLs:
http://www.cisco.com/en/US/docs/ios-xml/ios/ipaddr_dhcp/configuration/15-2s/
ip6-dhcpv6-guard.html
http://www.cisco.com/en/US/docs/routers/7600/ios/15S/configuration/guide/IPv6_Security.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios/wan/configuration/guide/wan_dst_ml_fr.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/swdynarp.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_eigrp/configuration/15-2s/ire-mib.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_eigrp/configuration/15-2s/ire-ipfrr.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
release/notes/ol27619.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/ipmulti_pim/configuration/15-2s/imc_hsrp_aware.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/ipmulti_igmp/configuration/15-2s/
imc_igmp_snoop.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/sec_conn_ike2vpn/configuration/15-2s/
sec-cfg-ikev2-flex.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/routers/7600/install_config/ES40_config_guide/es40_chap13.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/swy1731pm.html
For detailed information about this feature, see the document at the following URLs:
http://www.cisco.com/en/US/docs/ios-xml/ios/ipv6/configuration/15-2s/ipv6-dest-guard.html
http://www.cisco.com/en/US/docs/routers/7600/ios/15S/configuration/guide/IPv6_Security.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/routers/7600/ios/15S/configuration/guide/Configuring_IPv6_PACL.html
For detailed information about this feature, see the document at the following URLs:
http://www.cisco.com/en/US/docs/ios-xml/ios/ipv6/configuration/15-2s/ip6-ra-guard.html
http://www.cisco.com/en/US/docs/routers/7600/ios/15S/configuration/guide/IPv6_Security.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/sw6vpe.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/mp_l3_vpns/configuration/15-2s/
mp-mltvrf-slct-pbr.html
The IS-IS Bidirectional Forwarding Detection (BFD) Tag Length Value (TLV) feature provides a faster method to detect a loss of an IS-IS adjacency. Before, when an IS-IS adjacency reached the UP state (and therefore could be used for forwarding), a BFD session needed to be established with that neighbor. Now, a BFD session is maintained as long as the hello holddown timer for the neighbor does not expire, which is new for BFD TLV. The BFD session is only deleted if the neighbor hello times out. If BFD signals to IS-IS that a session has gone DOWN, the adjacency associated with that session will transition to DOWN state. Once the BFD session goes back UP, the adjacency state can transition back to an UP state.
For a given IS-IS topology, IS-IS determines if BFD is usable for a given neighbor on that topology. BFD is not usable when BFD is enabled on both sides and the BFD session is down. When there are multiple BFD sessions enabled for different address families, such as IPv4 and IPv6, if BFD is not usable for any address family, then BFD is consider not usable for the entire adjacency on that topology. For example, if both IPv4 and IPv6 BFD are enabled for single topology, if either the IPv4 BFD session is down or IPv6 BFD session is down, the neighbor state will be set to DOWN state. If BFD is not enabled for a given address family, then BFD is considered usable for that address family.
For single topology mode, the neighbor state is down when either the IPv4 or IPv6 BFD session is not BFD usable, that is, if BFD is enabled on both sides and the BFD session is DOWN. If BFD is not enabled on either side, BFD will be set to TRUE. For multi-topology mode, IS-IS adjacency will be in UP state as long as any topology is UP. However, the neighbor for the topology where BFD is consider not usable is considered down for that specific topology. For example, if both IPv4 and IPv6 BFD are enabled, and the IPv4 session is DOWN and IPv6 session is UP, then the IS-IS adjacency is still UP. In this case, the IPv4 neighbor is considered DOWN and ipv6 neighbor is considered UP.
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_isis/configuration/15-2s/ip6-route-isis-adm-tag.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bfd/configuration/15-2s/ip6-bfd-isis-client.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/cether/configuration/15-2s/ce-g8032-ering-pro.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/swmp_transport_profile.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/swmp_transport_profile.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/routers/7600/Hardware/15_0s/7600_hwd.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/mp_te_path_setup/configuration/15-2s/
mp-te-static-ipv6-over-ipv4-tunnels.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
chassis/configuration/guide/swmp_transport_profile.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
chassis/configuration/guide/swmp_transport_profile.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
chassis/configuration/guide/swmp_transport_profile.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
chassis/configuration/guide/swmp_transport_profile.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
chassis/configuration/guide/swmp_transport_profile.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
chassis/configuration/guide/swmp_transport_profile.html
For detailed information about this feature, see the document at the following URLs:
http://www.cisco.com/en/US/docs/ios-xml/ios/mp_l3_vpns/configuration/15-2s/mp-vpn-gre.html
http://www.cisco.com/en/US/docs/routers/7600/install_config/ES40_config_guide/es40_chap6.html
Platform: Cisco ME 3600X, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S
configuration/guide/swmcast.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/routers/7600/ios/15S/configuration/guide/mvpn.html
Platform: Cisco 7200, Cisco 7600
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/bsm/configuration/15-2s/bsm-ntpv4-mib.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/swospf_ttl.html
Platform: Cisco 7200, Cisco 7600
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_ospf/configuration/15-2s/iro-ospfv3-mib.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_ospf/configuration/15-2s/iro-ospfv3-nsr.html
Platform: Cisco 7200, Cisco 7600
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_ospf/command/iro-cr-book.html
Platform: Cisco 7200, Cisco 7600
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_ospf/configuration/15-2s/iro-cfg.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_ospf/command/iro-cr-book.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/ipmulti_pim/configuration/15-2s/imc_pim_allowrp.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/swqos.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_2_S/chassis/configuration/guide/swclocking.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/chassis/configuration/guide/swclocking.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/swy1731pm.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/swqos.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_ospf/configuration/15-2s/iro-ttl-sec-ospfv3.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/slb/configuration/15-2s/slb-15-2s-book.html
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/interfaces_modules/shared_port_adapters/configuration/7600series/76ovwpos.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/swmp_transport_profile.html
Platform: Cisco ME 3600X, Cisco ME 3600X-24CX, Cisco ME 3800X
For detailed information about this feature, see the document at the following URL:
http://www.cisco.com/en/US/docs/switches/metro/me3600x_3800x/software/release/15.2_4_S/
configuration/guide/swvrrp.html
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use the Cisco MIB Locator found at the following URL:
http://tools.cisco.com/ITDIT/MIBS/servlet/index
If the Cisco MIB Locator does not support the MIB information that you need, you can obtain a list of supported MIBs and download MIBs from the Cisco MIBs page at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
To access the Cisco MIB Locator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:
The following sections contain important notes about Cisco IOS Release 15.2S:
Behavior changes describe the minor modifications to the way a device works that are sometimes introduced in a new software release. These changes typically occur during the course of resolving a software defect and are therefore not significant enough to warrant the creation of a standalone document. When behavior changes are introduced, existing documentation is updated with the changes described in these sections.
The following behavior changes were introduced in Cisco IOS Release 15.2(4)S3:
Old Behavior: If the BGP Enhanced Attribute Error Handling feature is enabled, BGP places the MP_REACH attribute (attribute 14) at the beginning of the attributes list while formatting an update. If the feature is not enabled, BGP places the MP_REACH attribute at the end of the attributes list, which makes handling a malformed update more difficult for neighbor routers that are doing enhanced error handling.
New Behavior: Whether or not the BGP Enhanced Attribute Error Handling feature is enabled, BGP places the MP_REACH attribute (attribute 14) at the beginning of the attributes list while formatting an update. Enhanced error handling can function much more easily when the MP_REACH attribute is at the beginning of the attributes list.
Old Behavior: When a command of editor-type editor is configured, the router would copy the default profile to the default editor if the default editor was not modified.
New Behavior: The editor-type editor command only changes the editor-type but never copies default profiles to default editors. If users want to reuse previous profile configurations, they can use the test sbc profile-to-editor sip which helps to generate editor configurations from the profile.
Old Behavior: Initial INVITE with 0.0.0.0 is not supported unless ACK contains valid a IP address.
New Behavior: This call flow is supported.
http://www.cisco.com/en/US/docs/ios-xml/ios/voice/sip/configuration/15-mt/voi-sip-rfc.html#GUID-B6E5879A-D5DC-4E2C-BC97-AC927985E10E
Old Behavior: IOS devices do not conform to RFC 4303.
New Behavior: IOS devices conform to RFC 4303 to enable transmitting dummy packets.
Cisco IOS Security Command Reference: Commands A to C http://www.cisco.com/en/US/docs/ios-xml/ios/security/a1/sec-a1-cr-book.html
Cisco IOS Security Command Reference: Commands S to Z http://www.cisco.com/en/US/docs/ios-xml/ios/security/s1/sec-s1-cr-book.html
Old Behavior: SIP calls with TCP control-depleted stub control buffer.
New Behavior: A new command of sck-pool-size was added to configure the SIP socket control buffer size.
The following behavior changes were introduced in Cisco IOS Release 15.2(4)S2:
Old Behavior: The mp-recovery-enable keyword is not available for the hw-module slot command.
New Behavior: The mp-recovery-enable keyword is available.
Additional Information: http://www.cisco.com/en/US/docs/ios-xml/ios/interface/command/ir-f1.html#GUID-642623C0-B2E7-4C48-8163-534377F38142
Old Behavior: The NHRP syslog error message does not include the IP address of the node where the error originates, the source NBMA, and the destination address.
New Behavior: The NHRP syslog error message includes the IP address of the node where the error originates, the source NBMA, and the destination address.
Additional Information: http://cisco.com/en/US/docs/ios-xml/ios/sec_conn_dmvpn/configuration/15-s/sec-conn-dmvpn-tun-mon.html
Old Behavior: For IP-IP calls, there was no mechanism to limit the number of possible media loops before the media packets are dropped.
New Behavior: A CLI “rtp-media-loop count” is provisioned globally under voice service voip configuration mode to control the maximum loop count before media packets are dropped.
Addtional Information: http://www.cisco.com/en/US/docs/ios-xml/ios/voice/vcr3/vcr-r1.html
Old Behavior: The interworking vlan command does not work, which causes traffic failure.
New Behavior: The interworking vlan command is now working. However, you must enter the clear mpls ldp neighbor * command before using the interworking vlan command the first time.
Additional Information: http://www.cisco.com/en/US/docs/ios-xml/ios/mp_l2_vpns/configuration/15-s/mp-l2vpn-intrntwkg.html
The following behavior changes were introduced in Cisco IOS Release 15.2(4)S1:
Old Behavior: Outstanding access transactions are left unprocessed on RADIUS server.
New Behavior: The show aaa servers command output displays the number of access, authorization, and accounting requests and estimated outstanding/throttled access/accounting transactions that are being processed. The clear aaa counters servers all command clears all counters except estimated outstanding/throttled access/accounting transactions. These values will automatically reduce.
Additional Information: http://www.cisco.com/en/US/docs/ios-xml/ios/security/s1/sec-cr-s2.html#GUID-971F25CD-9424-4B5C-8B64-C344CBA0977D
http://www.cisco.com/en/US/docs/ios-xml/ios/security/a1/sec-cr-c1.html
#GUID-68BC9DC6-282E-4192-A4D1-B9DE80AD26A7
Old Behavior: Some ATM VC SNMP MlB objects of cAal5VccEntry type are not displayed when you use the snmpwalk application.
New Behavior: The missing ATM VC SNMP MIB objects are displayed.
Additional Information: http://www.cisco.com/en/US/docs/ios-xml/ios/snmp/command/nm-snmp-cr-book.htm
Old Behavior: When the neighbor remove-private-as command is configured and a route-map without a continue clause is configured, the processing order is:
1. neighbor remove-private-as processing
2. set as-path prepend or set as-path prepend last-as
However, if the route-map contains a continue clause, the processing order is reversed.
New Behavior: When the neighbor remove-private-as command is configured and a route-map is configured (whether it has a continue clause or not), the processing order is always:
1. neighbor remove-private-as processing
2. set as-path prepend or set as-path prepend last-as
Old Behavior: RTP packets of payload type “123” can cause errors on Cisco AS5350 and AS5400 series platforms.
New Behavior: RTP signal processing is disabled by default to prevent errors caused by RTP packets of payload type “123,” and can be enabled when necessary using the voice-fastpath voice-rtp-signalling enable command.
Additional Information: http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800a96c1.shtml
Old Behavior: Support was not available for applying VRF service on default sessions and for vrf mapping from vrf 1 to vrf 2 for an unclassified IP session. Also, the show subscriber lite-session command did not display the “service vrf” field.
New Behavior: Support is available for applying VRF service on default sessions and for vrf mapping from vrf 1 to vrf 2 for an unclassified IP session. Also, the show subscriber lite-session command displays the “service vrf” field.
Additional Information: http://www.cisco.com/en/US/docs/ios-xml/ios/isg/configuration/xe-3s/isg-wlkby-supp.html
Old Behavior: Cable detection existed on analog FXOLS voice port only.
New Behavior: Cable detection is extended to analog FXSLS, FXSGS, and FXOGS voice ports, and a new CLI cable-detect-poll-timer is introduced to configure the cable polling timer value for background polling processes.
Additional Information: http://www.cisco.com/en/US/docs/ios-xml/ios/voice/vcr1/vcr-c1.html
http://www.cisco.com/en/US/docs/ios-xml/ios/voice/vcr4/vcr-s9.html
#GUID-DDA37612-EDAE-42A4-B84E-1D1D345183B5
Old Behavior: IKEv2 default max in-neg CAC counter was 1000.
New Behavior: IKEv2 default max in-neg CAC counter has been modified to 40 and is true for all platforms.
Additional Information: http://www.cisco.com/en/US/docs/ios-xml/ios/security/s1/sec-cr-s3.html
New Behavior: ACL based IPv4 port feature works only if the trunk port is configured in prefer port mode.
Impact to customer: ACL based IPv4 port feature works only if the trunk port is configured in prefer port mode. Use the access-group mode prefer port command to configure the trunk port in prefer port mode.
Additional Information: http://www.cisco.com/en/US/docs/routers/7600/ios/15S/configuration/guide/pacl.html
Old Behavior: The threshold is missing for logout calls in the queue display. The CLI is hunt-group logout [ DND | HLog ].
New Behavior: The notify keyword and threshold number argument are added in the hunt-group logout command to enable the indication of the calls in queue for logout agents using the Hlog Programmable Line Key.
hunt-group logout [ DND | HLog | notify | t hreshold number ]
Old Behavior: Users cannot configure the commonProfile xml content.
New Behavior: Introduced the following new CLI to set parameters under commonProfile section in IP phone SEP*.cnf.xml configuration files.
service profile [phonePassword password | callLogBlfEnabled | backgroundImageAccess false]
Old Behavior: If a packet is sent to a null interface, a Cisco ASR 1000 Router does not respond with an ICMP unreachable packet.
New Behavior: If a packet is sent to a null interface, a Cisco ASR 1000 Router responds with an ICMP unreachable packet.
Additional Information: http://www.cisco.com/en/US/docs/ios-xml/ios/interface/configuration/xe-3s/ir-cfg-vir-if-xe.html#GUID-64A54530-30B1-43D7-A495-90065902E92D
Old behavior: When a request to free the binding is received the ODAP process searches for the IP and deletes it, due to which active bindings get deleted.
New behavior: A new check now compares the Virtual Access ID present in the binding before deleting the binding in order to control the issue of duplicate IDs. The s how ip dhcp server odap-statistics and clear ip dhcp server odap-statistics commands have been introduced as part of this behavior change.
Additional Information: http://www.cisco.com/en/US/docs/ios/ipaddr/command/reference/iad_book.html
Cisco IOS software images are subject to deferral. Cisco recommends that you view the deferral notices at the following location to determine if your software release is affected: