Cisco Cisco Nexus 5010 Switch Installation Guide
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Cisco Nexus 5500 Series NX-OS Software Upgrade and Downgrade Guide, Release 7.0(8)N1(1)
In-Service Software Upgrades
Layer-2 Protocols Impact
lists the ISSU impacts to Layer 2 protocols.
EPP
During an ISSU process, EPP messages are not received/transmitted on the
ISSU switch. New ports in FC port channels are not negotiated until the
ISSU completes. Additionally, FC Trunk Mode changes (E port to TE Port
and vice versa and the allowed VSAN list) are also not processed.
ISSU switch. New ports in FC port channels are not negotiated until the
ISSU completes. Additionally, FC Trunk Mode changes (E port to TE Port
and vice versa and the allowed VSAN list) are also not processed.
FCoE NPV Links
When the NPV/FCoE NPV switch is logged into a core switch through an
FCoE NPV link, it punches heartbeats, FIP keepalives (FKA), toward the
core switch for its own internal login session and all the host login sessions
pinned through this FCoE NPV link. This FKA interval of 8 seconds is less
than the ISSU downtime. Enter the disable-fka command on the core switch
VFC parameters to ensure that the core switch ignores any FKA events.
FCoE NPV link, it punches heartbeats, FIP keepalives (FKA), toward the
core switch for its own internal login session and all the host login sessions
pinned through this FCoE NPV link. This FKA interval of 8 seconds is less
than the ISSU downtime. Enter the disable-fka command on the core switch
VFC parameters to ensure that the core switch ignores any FKA events.
Table 4
ISSU Impact to Fibre Channel and FCoE Services (continued)
Service
Description
Table 5
ISSU Impact to Layer 2 Protocols
Protocol
Description
LACP
IEEE 802.3ad provides for the default slow aging timers to be transmitted
once every 30 seconds in steady state and to expire after 90 seconds. An
ISSU should not impact peers that rely on LACP because the recovery time
is less than 90 seconds.
once every 30 seconds in steady state and to expire after 90 seconds. An
ISSU should not impact peers that rely on LACP because the recovery time
is less than 90 seconds.
Fast LACP timers (hello=1 sec, dead=3 sec) are not supported with a
nondisruptive ISSU.
nondisruptive ISSU.
IGMP
IGMP does not disrupt existing flows of multicast traffic that are already
present, but new flows are not learned (and are dropped) until an ISSU
completes. New router ports or changes to router ports are not detected
during this time.
present, but new flows are not learned (and are dropped) until an ISSU
completes. New router ports or changes to router ports are not detected
during this time.
DCBX and LLDP
DCBX uses LLDP to exchange parameters between peer devices. Because
DCBX is a link-local protocol, when the switch undergoes an ISSU, the age
time is increased on all ports on the switches and FEXs that are being
upgraded.
DCBX is a link-local protocol, when the switch undergoes an ISSU, the age
time is increased on all ports on the switches and FEXs that are being
upgraded.
Manual configurations are ignored during this time.
CDP
During an ISSU, the time-to-live value is increased (180 seconds) if it is
less than the recommended timeout value. The configuration is ignored if
manually specified.
less than the recommended timeout value. The configuration is ignored if
manually specified.
L2MP IS-IS
Before a switch reboots for an ISSU, the switch transmits Layer 2 IS-IS
hellos on all interfaces to prevent neighbor switches from marking routes to
the ISSU switch as down. Any topology changes during this time are also
not acted upon until the ISSU completes.
hellos on all interfaces to prevent neighbor switches from marking routes to
the ISSU switch as down. Any topology changes during this time are also
not acted upon until the ISSU completes.