Cisco Cisco Packet Data Interworking Function (PDIF) Guía Para Resolver Problemas
Configuring System Settings
▀ Configuring Line Card and SPIO Port Redundancy
▄ Cisco ASR 5000 Series System Administration Guide
OL-22970-01
Configuring Line Card and SPIO Port Redundancy
Port redundancy for line cards and SPIOs provides an added level of redundancy that minimizes the impact of network
failures that occur external to the system. Examples include switch or router port failures, disconnected or cut cables, or
other external faults that cause a link down error.
failures that occur external to the system. Examples include switch or router port failures, disconnected or cut cables, or
other external faults that cause a link down error.
C
AUTION
:
To ensure that system line card and port-level redundancy mechanisms function properly, disable the
Spanning Tree protocol on devices connected directly to any system port. Failure to turn off the Spanning Tree protocol
may result in failures in the redundancy mechanisms or service outage.
may result in failures in the redundancy mechanisms or service outage.
By default, the system provides port-level redundancy when a failure occurs, or you issue the
command. In this mode, the ports on active and standby line cards (for example, 17/1 and 33/1 have the same MAC
address), but since only one of these ports may be active at any one time there are no conflicts. This eliminates the need
to transfer MAC addresses and send gratuitous ARPs in port failover situations. Instead, for Ethernet ports, three
Ethernet broadcast packets containing the source MAC address are sent so that the external network equipment (switch,
bridge, or other device) can re-learn the information after the topology change. However, if an line card removal is
detected, the system sends out gratuitous ARPs to the network because of the MAC address change that occurred on the
specific port.
address), but since only one of these ports may be active at any one time there are no conflicts. This eliminates the need
to transfer MAC addresses and send gratuitous ARPs in port failover situations. Instead, for Ethernet ports, three
Ethernet broadcast packets containing the source MAC address are sent so that the external network equipment (switch,
bridge, or other device) can re-learn the information after the topology change. However, if an line card removal is
detected, the system sends out gratuitous ARPs to the network because of the MAC address change that occurred on the
specific port.
With port redundancy, if a failover occurs, only the specific port(s) become active. For example; if port 17/1 fails, then
port 33/1 becomes active, while all other active ports on the line card in slot 17 remain in the same active state. In port
failover situations, use the
port 33/1 becomes active, while all other active ports on the line card in slot 17 remain in the same active state. In port
failover situations, use the
or
commands to check that ports are
active on both cards and that both cards are active.
Take care when administratively disabling a port that is one of a redundant pair. A redundant pair comprises both the
active and standby ports—for example 17/1 and 33/1. If 17/1 is active, administratively disabling 17/1 through the CLI
does not make 33/1 active. It disables both 17/1 and 33/1 because an action on one port has the same effect on both.
Refer to Enabling Line Card and SPIO Redundancy below and Creating and Configuring Ethernet Interfaces and Ports
in the System Element Configuration Procedures chapter.
active and standby ports—for example 17/1 and 33/1. If 17/1 is active, administratively disabling 17/1 through the CLI
does not make 33/1 active. It disables both 17/1 and 33/1 because an action on one port has the same effect on both.
Refer to Enabling Line Card and SPIO Redundancy below and Creating and Configuring Ethernet Interfaces and Ports
in the System Element Configuration Procedures chapter.
If card-level redundancy is initiated, there is no port-level redundancy in a line card or SPIO failover. The standby line
card or SPIO becomes active and all ports on that card become active. With line cards, the system automatically copies
all the MAC addresses and configuration parameters used by the failed line card to its redundant counterpart. The ports
on SPIOs keep their original MAC addresses, and the system automatically copies the failed SPIO‘s configuration
parameters to its redundant counterpart. The PAC/PSC automatically re-routes to its redundant line card.
card or SPIO becomes active and all ports on that card become active. With line cards, the system automatically copies
all the MAC addresses and configuration parameters used by the failed line card to its redundant counterpart. The ports
on SPIOs keep their original MAC addresses, and the system automatically copies the failed SPIO‘s configuration
parameters to its redundant counterpart. The PAC/PSC automatically re-routes to its redundant line card.
With the SPIO cards, any time there is a port or card switch gratuitous ARPs are sent.
I
MPORTANT
:
Be aware that in the case of a system with only one SMC and two SPIO cards, both SPIOs come up
online. Automatic switching of Ethernet ports does not occur in this scenario, but you can initiate card and port
switching by using the
switching by using the
and
commands.
Port redundancy can be configured to be revertive or non-revertive. With revertive redundancy service is returned to the
original port when service is restored.
original port when service is restored.
This feature requires specific network topologies to work properly. The network must have redundant switching
components or other devices that the system is connected to. The following diagrams show examples of a redundant
switching topologies and how the system reacts to various external network device scenarios.
components or other devices that the system is connected to. The following diagrams show examples of a redundant
switching topologies and how the system reacts to various external network device scenarios.