Unveiling of the Cisco IOS release 15.1(1)T was the extreme opposite of the CRS-3 and Catalyst 3750-X splashes; the next release of one of the foundations of Cisco’s core business deserved a modest two-paragraph mention in the What's New in Cisco Product Documentation page.
If you’re a voice guru, you’ll probably enjoy the list of 20+ voice-related new features, including the all-important Enhanced Music on Hold. For the rest of us, here’s what I found particularly interesting:
- Ethernet OAM is finally available on low-end platforms. Now it makes sense to implement end-to-end Carrier Ethernet architectures.
- IP SLA engine was rewritten.
- In a huge engineering effort, mpls mtu command was added to the GRE tunnel interface.
- 15.1T has parser concurrency and locking features from 12.2SRE. They give you a finer locking granularity when multiple engineers concurrently configure the same device.
- Zone-based firewall feature has a few more knobs and show commands.
- The police MQC command finally works on the SVI interfaces.
- DHCP zero-touch deployment allows you to pass pointer to a web-based router configuration to a newly-deployed router in a DHCP option.
And, finally ... Tcl supports UDP sockets and VRF-based sockets. We’ll have so much fun with this feature; for example, we’ll be able to wake a host from a router or connect to an external server residing in a VRF.