Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Instrukcja Użytkownika Pobierz pdf (Strona 103)

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Caveats for Cisco IOS Release 12.2(33)SRD through 12.2(33)SRD8

OL-10394-05 Rev. R0

as soon as a subnet session is created and next hop is installed for these subscribers as the logical

network id computed using the framed subnet mask received from AAA server as access accept

radius attribute.

Conditions: This condition will occur for subnet session feature in scenario where ISG interface is

defined under routed mode; however subscribers are connected over layer-2 cloud to this ISG

interface, that is, ISG is the default gateway for these subscribers.

Workaround: There is no workaround if the subnet session feature has to be deliberately used in

scenario as defined under conditions above. However this problem will not occur if the subscribers

are one hop or more away from ISG.

Further Problem Description: ISG subnet session feature is used to group a number of sessions

together using IP framed netmask attribute. The ISG subnet session feature can be used if ISG

interface is defined under routed mode.

For example IP addresses belonging to a client say 192.168.0.68/24, 192.168.0.69/24,

192.168.0.70/24 and 192.168.0.70/24 can be grouped together under one ISG session if at the time

of session creation a IP framed netmask 255.255.255.252 is returned in the access accept message

from AAA server. The subscribers are one or more hop away from ISG interface (10.10.10.1/24)

The IP Framed Netmask attribute is used to compute the range of IP addresses to be grouped

together under one ISG session. In example above, if a session is initiated firstly by IP address

192.168.0.69/24; then using IP Framed Netmask the computed range of IP addresses to be grouped

together will be 192.168.0.68 to 192.168.0.71.

Now in a scenario where ISG interface is defined under routed mode though the subscribers are

connected directly over Layer 2 cloud to ISG interface and Subnet Session is required to be used as

a feature; then the stated problem under section Symptom above will occur.

Using example above and applying to this problematic scenario - the IP addresses of client

192.168.0.68/24, 192.168.0.69/24, 192.168.0.70/24 and 192.168.0.70/24 have to be grouped

together under one ISG session using Subnet Session feature by returning a IP Framed Netmask

255.255.255.252 under Access Accept from AAA server, however the ISG interface

(192.168.0.1/24) in this scenario is the default gateway to these Client IP end points.

Now as soon as the session is created and authenticated and Subnet Session feature is installed the

next hop for these IP range 192.168.0.68 to 192.168.0.71 computed using IP Framed Netmask value

255.255.255.252 would be 192.168.0.68/30 resulting in traffic destined to all the range of IP

addresses grouped under Subnet Session forwarded to 192.168.0.68/30 instead of using ARP to

reach the IP end points directly.

• CSCsy84862

Symptoms: In a rare event, router may crash in EIGRP code after a peer bounce and route removal.

Conditions: Crash seen during EIGRP route updates.

Workaround: There is no workaround.

• CSCsy85171

Symptoms: Switch reports following messages:

CDL2 Read Error: Time out

CDL2 Write Error: Time out

Conditions: Occurs on a Catalyst 6500 switch running Cisco IOS Release 12.2(18)SXF.

Workaround: Re-seat the X2 modules. It is highly recommended to do a complete diagnostic test on

all modules.

• CSCsy86078

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