Specifications
15
Caveats for Cisco IOS Release 12.0
78-6455-12
Miscellaneous
• CSCds01012
When sending IPSec traffic across a second channel while the first channel is still up and passing
IPSec traffic, a Cisco router may stop passing traffic altogether. This condition has been observed
in the following situation:
–
There are two central sites (A and B in this example) with Cisco 3640 routers that are running
Cisco IOS Release 12.0(7)XK1.
–
There is a remote site with a Cisco 2621 router that is running Cisco IOS Release 12.0(7)XK1.
–
NAT and ML-PPP are not enabled.
–
Fast switching is disabled on all interfaces.
–
Crypto maps are applies to physical and virtual interfaces.
–
The two central sites are connected to the same OSPF area (backbone).
–
Each central site router has a PRI that the remote sites terminate on.
–
One remote site has a single BRI with two channels.
–
One channel is used to connect to the site A central router, and the other channel is used to
connect the site B central router.
–
Certain traffic goes through site A, and other traffic goes through site B.
The two links function properly when IPSec is not enabled on either link, or if IPSec is only enabled
on one link. The traffic is still passed properly if IPSec is enabled on both links if all traffic is being
routed through the main link. If the main link (the first BRI channel) goes down, it fails over to the
backup link, and the traffic is IPSec encrypted. There is no workaround.
• CSCds03292
When the committed access rate (CAR) is configured at the input of an interface using Frame Relay
or High-Level Data Link Control (HDLC) encapsulation on Engine 0 POS LC, the throughput of
the interface is 370 Mb/sec for a 256 byte packet. There is no workaround.
• CSCds04232
A PA-A3-OC3MM= port adapter (PA) may not be recognized by a Cisco Catalyst 5500 series
switch. The Versatile Interface Processor (VIP) reloads with a bus error when the PA is inserted.
There is no workaround.
• CSCds09499
Cisco IOS Software allocates calls to modems in the disconnecting state when it fails to find a free
modem. Cisco IOS Software sends a terminate signal to a modem and after two seconds assumes
that the modem is back to idle even if it does not receive an idle signal from the modem. This
assumption is incorrect for modems taking longer to terminate and for modems that have failed.
This situation results in RingNoAnswer (RNA) and a lower call success rate (CSR). There is no
workaround.
• CSCds11055
When Web Cache Communication Protocol (WCCP) is enabled on a Cisco 7500 series router
running Cisco IOS Release12.0(11)S, that the router performance may be degraded, packets were
lost on serial links, and internet connectivity may be lost. This situation may be related to the use
of an Inter-Switch Link (ISL) interface. There is no workaround.
• CSCds16618
Versatile interface processor (VIP) interfaces for Frame Relay subinterfaces and PPP interfaces are
initialized much later than route processor (RP) interfaces after a router reloads.