As you said, that command does not exist on packet tracer. The only
command I can suggest to you would be "show ip interface brief" which
will not show you the speeds though. This is mainly used to display ip
addresses assigned to layer 3 ports. Alternatively, you just need to
use "show interface" and view all the details of the port. But with
"show ip interface brief", it will at least show you the status. –
Packet Tracer does not support this command yet. (v7.1.1).
Packet Tracer is a simulator and it comes with some limitations. It does not run all commands that run in real Switches or Routers.
GNS3 is an alternative to Packet Tracer and it supports this commands.
Try GNS3: https://www.gns3.com
What is GNS3?
GNS3 allows you to visualize, plan, test and troubleshoot network
environments across any vendor platform at scale - without the need to
directly interact with the network hardware. With the intuitive
graphical interface, users can seamlessly connect all types of virtual
interfaces to compose a real representation of networks. GNS3 runs on
traditional PC hardware and may be used on multiple operating systems,
including Windows, Linux, and MacOS X.
What is the difference between an emulator and a simulator?
An emulator will run an exact copy of an actual network operating
system. A simulator is designed to have a resemblance to the actual
network operating system, but only 'simulate' functions. GNS3
Ironically has 'simulator' in its acronym, but it simulates entire
networks, not just network operating systems. Most users use GNS3 to
emulate Cisco IOS as well as other vendors. But what sets GNS3 apart
from other simulators, is its ability to EMULATE routing and switching
as well as incorporate REAL virtual machines and connect them together
via a logical tunneling system (overlay network). That is why it is
better to say where other software SIMULATE, GNS3 has made advances to
EMULATE your real production networks.
What is the difference between GNS3 and Packet Tracer / VIRL?
Packet Tracer and VIRL are Cisco's offerings and answers to the
advancement of GNS3's advanced EMULATION. There are strengths and
weaknesses to each product, but GNS3 is first in Emulating real
production networks. For more information attached are some recent
articles written on the comparison: Cisco VIRL vs. GNS3 - How They
Compare - GlobalConfig.net (Un)Biased review of someone who used VIRL