Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Manual de usuario Pagina 161

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Caveats for Cisco IOS Release 12.2(33)SRD through 12.2(33)SRD8
OL-10394-05 Rev. R0
Symptoms: In the pseudowire stitching configuration, if fast reroute (FRR) is enabled for link or
node protection at the tunnel stitching router, then end-to-end connectivity is broken.
Conditions: Problem happens only if a Cisco 7600 is the stitching-point router and has MPLS Fast
Reroute enabled.
Workaround: Disable FRR at the stitching point.
CSCsv86288
Symptoms: Sending a NETCONF hello reply which contains a “session-id” element triggers an
instant crash. The device will report a reload due to a bus error.
Conditions: This occurs when sending a hello reply which contains a session-id element. A hello
without this element, one which only contains NETCONF capabilities, does not cause a crash.
Workaround: Send a NETCONF hello without a session-id element.
CSCsv89643
Symptoms: If Ethernet interface configured as Open Shortest Path First (OSPF) point-to-point
network then adjacency is being established using only multicast packets. As a result routes
calculated over the link do not have MAC address of next-hop’s IP resolved prior to routes being
installed into the routing table. This leads to delay for routes to become usable as lower-level
protocols have to trigger MAC resolution. During short period of time traffic sent over the interface
is lost when routes are just installed for the first time.
Conditions: Occurs when Ethernet interface is configured for OSPF point-to-point.
Workaround: Problem will self-correct because passing traffic triggers MAC address resolution.
CSCsv90323
Symptoms: ISSU upgrade to Cisco IOS Release 12.2(33)SRD did not put router into route processor
redundancy (RPR) mode.
Conditions: Occurs when no service image-version efsu is enabled. During ISSU upgrade from
Cisco IOS Release 12.2(33)SRB or SRC to Cisco IOS Release 12.2(33)SRD, the router incorrectly
goes into stateful switchover (SSO). The correct mode is RPR because SSO ISSU from these
releases to Cisco IOS Release 12.2(33)SRD is not supported.
Workaround: Remove the no service image-version efsu configuration by the default service
image-version efsu and continue the upgrade process.
Further Problem Description: If any of the following Config, Exec or ROMMON variables are set,
the SSO-based ISSU will not be blocked:
Config:
“no service image-version efsu”,
“no service image-version compatibility”,
Exec:
“issu image-version compatibility disable”,
ROMMON variable:
RED_MODE = “RPR_PLUS’
RED_MODE_SSO
RF_REDUN_COMP = 1
When performing any ISSU upgrade from SRB/SRC to SRD, make sure none of the above overrides
is set on the router. The service image-version efsu command detects the incompatibility and puts
the router in RPR mode.
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