Cisco OL-4015-08 Bedienungsanleitung PDF herunterladen (Seite 424)

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Cross-Platform Release Notes for Cisco IOS Release 12.0S

OL-1617-14 Rev. Q0

Caveats

Resolved Caveats—Cisco IOS Release 12.0(31)S3

• CSCsb25404

Symptoms: The startup configuration in NVRAM is not loaded onto line cards when the router is

manually reloaded.

Conditions: This symptom is observed on a Cisco 12000 series that functions as a multiservice edge

(MSE) router when the ATM Cell Relay over MPLS feature is configured on 500 connections. The

symptom may also occur on other platforms.

Workaround: After the router has been reloaded, cut and paste the initially rejected configuration

onto the line cards.

• CSCsb28139

Symptoms: An LDP/BGP adjacency is not formed, and a ping does not go through.

Conditions: This symptom is observed on a Cisco 12000 series that functions in a scaled VPN

environment when an Engine 6 line card faces the core of the MPLS network.

Workaround: Enter the clear ip route * command.

• CSCsb38396

Symptoms: When a 2-port or 4-port channelized T3 to DS0 SPA is configured with MFR

subinterfaces and when you enter the shutdown interface configuration command followed by the

no shutdown interface configuration command on one of the subinterfaces, the subinterface does

not come up.

Conditions: This symptom is observed on a Cisco 12000 series.

Workaround: Enter the shutdown interface configuration command followed by the no shutdown

interface configuration command on the main interface to enable the subinterface to come up.

• CSCsb39165

Symptoms: A Cisco router may report high CPU usage and memory depletion under a specific

MPLS VPN configuration with static routes.

Conditions: This symptom is observed when equal cost static routes to a subnet point to a next hop

address and there is a summary route that covers one of the next hops pointing to Null0.

If the directly connected route to the next hop is terminated because the interface goes down, the

original route recurses to Null0 while the route recursing through the interface that is still up remains

in the routing table. The end result is that the route now points to both Null0 and to a valid interface

that is up, causing an MPLS recursion problem that results in high CPU usage and memory

depletion.

The following is an example configuration:

ip route a.a.a.a b.b.b.b y.y.y.y

ip route a.a.a.a b.b.b.b z.z.z.z

ip route y.y.y.y mask Null0

If the directly connected route y.y.y.y is removed the a/b subnet recurses through the y.y.y.y/mask

route to Null0.

Workaround: Use routes that point to both a next hop and an egress interface, as in the following

example:

ip route a.a.a.a b.b.b.b interfaceY y.y.y.y

ip route a.a.a.a b.b.b.b interfaceZ z.z.z.z

Workaround: There is no workaround.

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