There is a new release model that provides maintenance releases (labeled "M" releases) along with the traditional T-train code. One of the biggest changes in 15.0 IOS is the release model. New policy - no CLI use on the routers anymore. The rate of packets being dropped will be proportional to the rate of traffic. Symptoms: Packet drop occurs when show version, show run, and write memory commands are issued.Ĭonditions: Packet drop will be observed as input errors accounted as overruns. Workaround: Add a static route to the next-hop networkĪDD A STATIC ROUTE? That's like my idea to fix anything with a tunnel! Symptoms: FTP traffic is not policy routed.Ĭonditions: Above symptom is seen on Cisco routers configured for local PBR with set IP next-hop clause. Symptoms: Cyclic redundancy check (CRC) errors increment on Cisco 2800 router.Ĭonditions: Occurs during normal operation. Symptoms: Configuring and unconfiguring hierarchical QoS may cause memory leak on a Cisco router.Ĭonditions: This symptom occurs on a Cisco router that is running Cisco IOS Release 12.4(15)T4. Here are a few scary ones (with my pithy comments of course): Oh, and yes, there are those bugs.or as Cisco likes to call them in a new IOS release, "caveats".
A complete list of memory requirements and supported hardware in each router line is provided also. The 2600XM, 3600, and 3700-series routers are now officially gone. There are a few notable hardware lines that are not supported in 15.0.
If you are still running AppleTalk forever live in shame after reading this blog.
Perhaps internal code work in Cisco had a few other main line releases in the last 4-years that never materialized into real products.ġ5.0 includes a few new supported hardware devices and a large set of new software features.Ĭisco removed only two software features in 15.0 - AppleTalk Phase I & II and Service Selection Gateway (SSG). Apparently Cisco was not interested in using the 12.5 name or 13.0 or 14.0 names. It's been over 4 years since Cisco has delivered a major release of IOS code. This is the next major release after 12.4.