User guide

21
Release Notes for Cisco IOS Release 12.4T
OL-8012-09 Rev. B0
Platform-Specific Information
!
voice-port 3
timing hookflash-in 0
!
voice-port 4
timing hookflash-in 0
!
!
line con 0
exec-timeout 0 0
transport input none
stopbits 1
line vty 0 4
password lab
login
!
scheduler max-task-time 5000
end
Downloading Images
Delete files in the router flash memory before attempting to download new images.
Caution Use the delete command, not the erase command, to free up space. Entering the erase command
removes all files, including the configuration.
Flash Memory
Cisco 800 series routers (Cisco 815, Cisco 830, Cisco 850, Cisco 870) use 4 MB of flash memory for
storing internal information such as the ROM monitor. Only the remainder of the flash memory is
available for storing Cisco IOS images and is displayed by using the show flash command. For example,
if the router reports 8 MB of flash, the actual amount of onboard flash memory is 12 MB, even though
only 8 MB are displayed and available for Cisco IOS image storage.
Cisco 860 series routers use 2 MB of flash memory for storing internal information such as the ROM
monitor. There is a separate 128 MB of flash memory available for storing Cisco IOS images and is
displayed by using the show flash command.
Cisco 880 series routers use 4 MB of flash memory for storing internal information such as the ROM
monitor. There is a separate 256 MB of flash memory available for storing Cisco IOS images and is
displayed by using the show flash command.
Multilink PPP and Interleaving
Multilink PPP fragments large data packets to allow small voice packets to be interleaved between them.
However, apart from FIFO queueing, no other kind of output queueing mechanisms are supported with
PPP over ATM. Consequently, when multilink PPP is configured on the Cisco 800 series routers, large
packets are fragmented, but small voice packets are not interleaved between them.
NAT Support for H.323 Signaling
NAT does not support alerting H.225 messages; therefore, NAT communication cannot be established
between router endpoints. NAT support for H.323 signaling is limited to the application NetMeeting.