Specifications

6 Release Notes for Cisco uBR904 Cable Access Router for Cisco IOS Release 12.0(7)T
New and Changed Information
as the peer’s IP address). The dynamic crypto map allows you to accept requests for new security
associations from previously unknown peers. These requests, however, are not processed until the
ISAKMP (IKE) authentication has completed successfully.
When the firewall receives a negotiation request via IKE from another IPSec peer, the request is
examined to see if it matches a crypto map entry. If the negotiation does not match any explicit
crypto map entry, it will be rejected unless the crypto map set includes a reference to a dynamic
crypto map.
If the firewall accepts the peer’s request, at the point that it installs the new IPSec security
associations, it also installs a temporary crypto map entry. This entry is filled in with the results of
the negotiation. At this point, the firewall performs normal processing, using this temporary crypto
map entry as a normal entry, even requesting new security associations if the current ones are
expiring (based on the policy specified in the temporary crypto map entry). After all of the
corresponding security associations expire, the temporary crypto map entry is removed.
Dynamic crypto map sets are not used for initiating IPSec security associations. However, they are
used for determining whether or not traffic should be protected.
Note The only parameter required in a dynamic crypto map is the set transform-set. All other
parameters are optional.
No New Hardware Features In Release 12.0(5)T
There are no new hardware features supported by the Cisco uBR904 cable access router for
Release 12.0(5)T.
New Software Features in Release 12.0(5)T
Enhanced Bridging
Using previous Cisco IOS images, only three PCs can be directly connected to three of the four
Ethernet hub ports at the rear of the Cisco uBR904 cable access router and operate correctly in
bridging mode. The three-node directly-connected bridge limit existed due to the MAC chip
contained in the unit. The MAC chip reserved one filter for the Cisco uBR904 cable access router’s
MAC address, leaving three available for Ethernet devices.
Cisco IOS 12.0(5)T images contain enhanced software, allowing 1 to 254 PCs to operate in bridging
mode. Using Cisco IOS 12.0(5)T images, four PCs can be directly connected to four Ethernet hub
ports or one of the four ports can be connected to an Ethernet hub, which then connects additional
computers or devices at the site. For additional information regarding the bridging operation, see
“Bridging Mode” in “Limitations and Restrictions.”
No New Hardware Features In Release 12.0(4)T
There are no new hardware features supported by the Cisco uBR904 cable access router in
Cisco IOS Release 12.0(4)T.