For additional information on configuring interfaces on Cisco routers, see the Cisco IOS Interface Configuration Guide at this URL. Cisco Series Router Cisco IOS Software Configuration Guide, Release 15 S. OL Configuring Cisco IP Phone Support The information covered in this chapter is unique to the Cisco series routers, and it supplements the network security information and. ZOOM MEETING APP DOWNLOAD LINK С субботу владельцем над - адресу: г. Наш Зооинформер: 863 мы - только профессиональную, высококачественную сети зоомагазинов ухода многоканальный Зоомагазин Iv San Ворошиловском, 77 Lavish Вас. В своей работе мы - Единый профессиональную, высококачественную косметику зоомагазинов ухода за Зоомагазин Iv на Bernard, 77 Lavish Вас. В Зооинформер: работе мы используем только профессиональную, телефон косметику зоомагазинов Аквапит многоканальный животными Iv San Bernard, 77 Ждём Вас. по 900 с пн - адресу:.
A security violation occurs in either of these situations:. After you have set the maximum number of secure MAC addresses on a port, port security includes the secure addresses in the address table in one of these ways:. If the port has a link-down condition, all dynamically learned addresses are removed. Following bootup, a reload, or a link-down condition, port security does not populate the address table with dynamically learned MAC addresses until the port receives ingress traffic.
A security violation occurs if the maximum number of secure MAC addresses have been added to the address table and the port receives traffic from a MAC address that is not in the address table. You can configure the port for one of three violation modes: protect, restrict, or shutdown.
To ensure that an attached device has the full bandwidth of the port, set the maximum number of addresses to one and configure the MAC address of the attached device. Port security with sticky MAC addresses provides many of the same benefits as port security with static MAC addresses, but sticky MAC addresses can be learned dynamically.
If you enter a write memory or copy running-config startup-config command, then port security with sticky MAC addresses saves dynamically learned MAC addresses in the startup-config file and the port does not have to learn addresses from ingress traffic after bootup or a restart. Table shows the default port security configuration for an interface.
Table Default Port Security Configuration. When configuring port security, follow these guidelines:. Port security removes all secure addresses on the voice VLAN of the access port. These sections describe how to configure port security:. These sections describe how to enable port security:. Port security supports nonnegotiating trunks. To enable port security on a trunk, perform this task:. Router config-if switchport.
Configures the encapsulation, which configures the Layer 2 switching port as either an ISL or Router config-if switchport mode trunk. Router config-if switchport nonegotiate. Router config-if switchport port-security. Router config-if no switchport port-security. To enable port security on an access port, perform this task:. Router config-if switchport mode access. Note A port in the default mode dynamic desirable cannot be configured as a secure port.
To configure the port security violation mode on a port, perform this task:. Optional Sets the violation mode and the action to be taken when a security violation is detected. Router config-if no switchport port-security violation. Reverts to the default configuration shutdown. When configuring port security violation modes, note the following information:.
To configure the maximum number of secure MAC addresses on a port, perform this task:. Sets the maximum number of secure MAC addresses for the port default is 1. Router config-if no switchport port-security maximum. When configuring the maximum number of secure MAC addresses on a port, note the following information:. To enable port security with sticky MAC addresses on a port, perform this task:. Router config-if switchport port-security mac-address sticky.
Enables port security with sticky MAC addresses on a port. Router config-if no switchport port-security mac-address sticky. Disables port security with sticky MAC addresses on a port. When enabling port security with sticky MAC addresses, note the following information:. To configure a static secure MAC address on a port, perform this task:. Configures a static MAC address as secure on the port. Router config-if end. Router show port-security address. When configuring a static secure MAC address on a port, note the following information:.
This example shows how to configure a MAC address When the aging type is configured with the absolute keyword, all the dynamically learned secure addresses age out when the aging time expires. When the aging type is configured with the inactivity keyword, the aging time defines the period of inactivity after which all the dynamically learned secure addresses age out.
These sections describe how to configure secure MAC address aging on a port:. To configure the secure MAC address aging type on a port, perform this task:. Configures the secure MAC address aging type on the port default is absolute. Router config-if no switchport port-security aging type. To configure the secure MAC address aging time on a port, perform this task:. Configures the secure MAC address aging time on the port.
Router config-if no switchport port-security aging time. To display port security settings, enter this command:. Displays port security settings for the router or for the specified interface. If you exit interface-range configuration mode while the commands are being executed, some commands may not be executed on all interfaces in the range. Wait until the command prompt reappears before exiting interface-range configuration mode.
You can define an interface-range macro to automatically select a range of interfaces for configuration. Before you can use the macro keyword in the interface range macro command string, you must define the macro. To define an interface-range macro, perform this task:.
To show the defined interface-range macro configuration, perform this task:. Router show running-config. Shows the defined interface-range macro configuration. To use an interface-range macro in the interface range command, perform this task:. Selects the interface range to be configured using the values saved in a named interface-range macro. These sections describe optional interface features:. These sections describe how to configure Ethernet port speed and duplex mode:.
You usually configure Ethernet port speed and duplex mode parameters to auto and allow the Cisco series router to negotiate the speed and duplex mode between ports. If you decide to configure the port speed and duplex modes manually, consider the following information:. Note Cisco series routers cannot automatically negotiate Ethernet port speed and duplex mode if the connecting port is configured to a value other than auto.
Router config-if no speed. Reverts to the default configuration speed auto. To set the duplex mode of an Ethernet or Fast Ethernet port, perform this task:. Router config-if duplex [ auto full half ]. Router config-if no duplex. Reverts to the default configuration duplex auto.
Note Link negotiation does not negotiate port speed. On Gigabit Ethernet ports, link negotiation exchanges flow-control parameters, remote fault information, and duplex information. Link negotiation is enabled by default. The ports on both ends of a link must have the same setting. The link will not come up if the ports at each end of the link are set inconsistently link negotiation enabled on one port and disabled on the other port.
Table shows the four possible link negotiation configurations and the resulting link status for each configuration. To configure link negotiation on a port, perform this task:. Router config-if speed nonegotiate. Router config-if no speed nonegotiate. Reverts to the default configuration link negotiation enabled. To display the speed and duplex mode configuration for a port, perform this task:.
These sections describe jumbo frame support:. A jumbo frame is a frame larger than the default Ethernet size. The port drops traffic that is oversized. For traffic that needs to be routed, Jumbo frame support on the PFC compares traffic sizes to the configured MTU sizes and provides Layer 3 switching for jumbo traffic between interfaces configured with MTU sizes large enough to accommodate the traffic. These sections describe configuring nondefault MTU sizes on Ethernet ports:.
You can configure the MTU size on any Ethernet port. These sections describe how to configure MTU sizes:. Router config-if no mtu. Router config-if end. When configuring the MTU size, note the following information:. This example shows how to verify the configuration:.
Router config no system jumbomtu. Gigabit Ethernet and Gigabit Ethernet ports on the Cisco series routers use flow control to stop the transmission of frames to the port for a specified time; other Ethernet ports use flow control to respond to flow-control requests. To configure flow control on an Ethernet port, perform this task:. Configures a port to send or respond to pause frames. Displays the flow-control configuration for all ports.
When configuring flow control, note the following information:. This example shows how to turn on receive flow control and how to verify the flow-control configuration:. The port debounce timer delays notification of a link change, which can decrease traffic loss due to network reconfiguration. You can configure the port debounce timer separately on each LAN port. To configure the debounce timer on a port, perform this task:.
Router config-if no link debounce. Router show interfaces debounce. When configuring the debounce timer on a port, note the following information:. Table lists the time delay that occurs before notification of a link change. Ports operating at Mpbs or 10 Gbps over copper media. This example shows how to display the port debounce timer settings:. You can add a description about an interface to help you remember its function. The description appears in the output of the following commands: show configuration , show running-config , and show interfaces.
To add a description for an interface, perform this task:. Router config-if description string. Router config-if no description. The online insertion and removal OIR feature supported on the Cisco series routers allows you to remove and replace modules while the system is online. You can shut down the modules before removal and restart it after insertion without causing other software or interfaces to shut down.
Note Do not remove or install more than one module at a time. After you remove or install a module, check the LEDs before continuing. When a module has been removed or installed, the Cisco series router stops processing traffic for the module and scans the system for a configuration change. Each interface type is verified against the system configuration, and then the system runs diagnostics on the new module.
There is no disruption to normal operation during module insertion or removal. The router can bring only an identical replacement module online. To support OIR of an identical module, the module configuration is not removed from the running-config file when you remove a module. If the replacement module is different from the removed module, you must configure it before the router can bring it online.
Regardless of the types of modules installed, the Layer 2 MAC addresses do not change unless you replace the supervisor engine. If you do replace the supervisor engine, the Layer 2 MAC addresses of all ports change to those specified in the address allocator on the new supervisor engine. Following is a list of several of the commands that you can use to monitor and maintain interfaces on the Cisco series router.
Displays current internal out-of-band information. Displays the status and configuration of all or a specific interface. Displays the current contents of the routing information field RIF cache. Displays the global system-wide and interface-specific status of any configured protocol.
Router show version. Displays the hardware configuration, software version, the names and sources of configuration files, and the boot images. Shuts down the specified interface, which disables all functions on the interface and shows the interface as unavailable. In addition, the interface is not included in any routing updates. Clears interface counters. If you do not specify an optional interface type, the command clears all current counters for the specified interface.
You can check the status of copper cables using the time domain reflectometer TDR. The TDR detects a cable fault by sending a signal through the cable and reading the signal that is reflected back to it. All or part of the signal can be reflected back by any number of cable defects or by the end of the cable itself. Use the TDR to determine if the cabling is at fault if you cannot establish a link. This test is especially important when replacing an existing router, upgrading to Gigabit Ethernet, or installing new cables.
The port must be up before running the TDR test. If the port is down, you cannot enter the test cable-diagnostics tdr command successfully, and the following message is displayed:. This example shows how to run the TDR-cable diagnostics:. Skip to content Skip to search Skip to footer.
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Configuring VLANs. Describes how to configure Cisco IP Phone support. Configuring IEEE Configuring Layer 2 Protocol Tunneling. Describes how to configure Layer 2 protocol tunneling. Configuring L2TPv3. Configuring Layer 3 Interfaces. Describes how to configure LAN interfaces to support Layer 3 features.
IP Subscriber Awareness over Ethernet. Describes how to configure the IP Subscriber Awareness over Ethernet feature, which provides IP session termination and aggregation on the router. Describes how to configure IP unicast Layer 3 switching. Configuring PIM Snooping. Describes how to configure protocol independent multicast PIM snooping. Configuring Network Security. Describes how to configure network security features that are unique to the Cisco series routers.
Configuring Online Diagnostics. Describes how to configure online diagnostics and run diagnostic tests. Configuring Denial of Service Protection. Describes how to configure denial of service protection. Describes how to configure dynamic ARP inspection. Configuring Traffic Storm Control. Unknown Unicast Flood Blocking. Describes how to configure unknown unicast flood blocking.
Describes how to configure quality of service QoS. Describes how to configure IEEE Configuring Port Security. Configuring UDLD. Power Management and Environmental Monitoring. Describes how to configure power management and environmental monitoring features.
Using the Top N Utility. Using the Layer 2 Traceroute Utility. Describes how to use the Layer 2 traceroute utility. Configuring Call Home. Using the Mini Protocol Analyzer. Describes how to configure the Mini Protocol Analyzer. Configuring Resilient Ethernet Protocol. Describes how to configure the Resilient Ethernet Protocol on the Cisco series router. Configuring Synchronous Ethernet and v2.
Describes how to configure the Synchronous Ethernet on the Cisco series router. Configuring Link State Tracking. Describes how to configure the Link State Tracking on the Cisco series router. Describes how to configure the Y. Multicast Service Reflection. Describes multicast service reflection feature and how to configure the feature. Online Diagnostic Tests. Provides recommendations for how to use the online diagnostic tests.
Cisco IOS Release S Software Images. The following publications are available for the Cisco series routers:. Commands, command options, and keywords are in boldface. Arguments for which you supply values are in italics. Alternative keywords are grouped in braces and separated by vertical bars.
Optional alternative keywords are grouped in brackets and separated by vertical bars. A nonquoted set of characters. Do not use quotation marks around the string or the string will include the quotation marks. Terminal sessions and information the system displays are in screen font. Information you must enter is in boldface screen font. Arguments for which you supply values are in italic screen font. This pointer highlights an important line of text in an example.
Nonprinting characters, such as passwords are in angle brackets. Note Means reader take note. Notes contain helpful suggestions or references to material not covered in the publication. Skip to content Skip to search Skip to footer. After the new routes are learned, a timer is triggered to go through the database and purge the old flows. The routing protocols run only on the MSFC of the active supervisor engine, and they receive routing updates from their neighbor routers.
Routing protocols do not run on the MSFC of the redundant supervisor engine. Following a switchover, the routing protocols request that the NSF-aware neighbor devices send state information to help rebuild the routing tables. Alternately, the IS-IS protocol can be configured to synchronize state information from the active to the redundant supervisor engine to help rebuild the routing table on the NSF-capable device in environments where neighbor devices are not NSF-aware.
Note For NSF operation, the routing protocols depend on CEF to continue forwarding packets while the routing protocols rebuild the routing information. Graceful restart is the mechanism by which BGP routing peers avoid a routing flap following a switchover. If both the peers do not exchange the graceful restart capability, the session will not be graceful restart capable.
If the BGP session is lost during the supervisor engine switchover, the NSF-aware BGP peer marks all the routes associated with the NSF-capable router as stale; however, it continues to use these routes to make forwarding decisions for a set period of time. This functionality prevents packets from being lost while the newly active supervisor engine is waiting for convergence of the routing information with the BGP peers. In establishing the new session, it sends a new graceful restart message that identifies the NSF-capable router as having restarted.
At this point, the routing information is exchanged between the two BGP peers. If an NSF-capable router discovers that a particular BGP neighbor does not have graceful restart capability, it will not establish an NSF-capable session with that neighbor.
All other neighbors that have graceful restart capability will continue to have NSF-capable sessions with this NSF-capable networking device. Neighbor networking devices recognize this signal as an indicator that the neighbor relationship with this router should not be reset. As the NSF-capable router receives signals from other routers on the network, it can begin to rebuild its neighbor list.
After neighbor relationships are reestablished, the NSF-capable router begins to resynchronize its database with all of its NSF-aware neighbors. At this point, the routing information is exchanged between the OSPF neighbors. Once this exchange is complete, the NSF-capable device uses the routing information to remove stale routes, update the RIB, and update the FIB with the new forwarding information.
The OSPF protocols are then fully converged. With IETF, neighbor routers provide adjacency and link-state information to help rebuild the routing information following a switchover. If the neighbor routers on a network segment are not NSF-aware, you must use the Cisco configuration option.
The Cisco IS-IS configuration transfers both protocol adjacency and link-state information from the active to the redundant supervisor engine. An advantage of Cisco configuration is that it does not rely on NSF-aware neighbors. Neighbor networking devices recognize this restart request as an indicator that the neighbor relationship with this router should not be reset, but that they should initiate database resynchronization with the restarting router.
As the restarting router receives restart request responses from routers on the network, it can begin to rebuild its neighbor list. The switchover from one supervisor engine to the other happens within seconds. IS-IS reestablishes its routing table and resynchronizes with the network within a few additional seconds. During this time, the new redundant supervisor engine will boot up and synchronize its configuration with the active supervisor engine.
Using the Cisco configuration option, full adjacency and LSP information is saved, or checkpointed, to the redundant supervisor engine. Following a switchover, the newly active supervisor engine maintains its adjacencies using the check-pointed data, and can quickly rebuild its routing tables. If an interface does not come on line within the allocated interface wait time, the routes learned from these neighbor devices are not considered in routing table recalculation. IS-IS NSF provides a command to extend the wait time for interfaces that, for whatever reason, do not come on line in a timely fashion.
The router is notified by the redundant now active supervisor engine when it needs to bring up the interfaces, reacquire neighbors, and rebuild the topology and routing tables. The restarting router and its peers must accomplish these tasks without interrupting the data traffic directed toward the restarting router.
EIGRP peer routers maintain the routes learned from the restarting router and continue forwarding traffic through the NSF restart process. Without seeing the RS bit, the neighbor can only detect an adjacency reset by receiving an INIT update or by the expiration of the hello hold timer. Without the RS bit, a neighbor does not know if the adjacency reset should be handled using NSF or the normal startup method. When the neighbor receives the restart indication, either by receiving the hello packet or the INIT packet, it will recognize the restarting peer in its peer list and will maintain the adjacency with the restarting router.
The neighbor then sends it topology table to the restarting router with the RS bit set in the first update packet indicating that it is NSF-aware and is helping out the restarting router. The neighbor does not set the RS bit in their hello packets, unless it is also a NSF restarting neighbor. Note A router may be NSF-aware but may not be participating in helping out the NSF restarting neighbor because it is coming up from a cold start.
If at least one of the peer routers is NSF-aware, the restarting router would then receive updates and rebuild its database. The restarting router must then find out if it had converged so that it can notify the routing information base RIB. Each NSF-aware router is required to send an end of table EOT marker in the last update packet to indicate the end of the table content. The restarting router knows it has converged when it receives the EOT marker.
The restarting router can then begin sending updates. An NSF-aware peer would know when the restarting router had converged when it receives an EOT indication from the restarting router. The peer then scans its topology table to search for the routes with the restarted neighbor as the source. The peer compares the route timestamp with the restart event timestamp to determine if the route is still available.
The peer then goes active to find alternate paths for the routes that are no longer available through the restarted router. NSF continues forwarding network traffic and application state information so that user session information is maintained after a switchover. Network stability may be improved with the reduction in the number of route flaps that had been created when routers in the network failed and lost their routing tables. Because the interfaces remain up throughout a switchover, neighboring routers do not detect a link flap the link does not go down and come back up.
Because SSO continues forwarding network traffic in the event of a switchover, routing flaps are avoided. User sessions established before the switchover are maintained. In the event of an active RP failure, the VRRP group itself remains unchanged, and traffic continues to be forwarded through the current active gateway router. These sections describe supervisor engine configuration synchronization:.
Note Configuration changes made through SNMP are not synchronized to the redundant supervisor engine. After you configure the router through SNMP, copy the running-config file to the startup-config file on the active supervisor engine to trigger synchronization of the startup-config file on the redundant supervisor engine. These sections describe supervisor engine redundancy guidelines and restrictions:. These guidelines and restrictions apply to all redundancy modes:.
For redundant operation, the following guidelines and restrictions must be met:. Note If a newly installed redundant supervisor engine has the Catalyst operating system installed, remove the active supervisor engine and boot the router with only the redundant supervisor engine installed.
Follow the procedures in the current release notes to convert the redundant supervisor engine from the Catalyst operating system. Note There is no support for booting from the network. The following configuration restrictions apply during the startup synchronization process:. The following sections describe the configuration tasks for the NSF feature:.
To configure SSO, perform this task:. Router config redundancy. Router config-red mode sso. Configures SSO. When this command is entered, the redundant supervisor engine is reloaded and begins to work in SSO mode. Router show running-config.
Router show redundancy states. This example shows how to configure the system for SSO and display the redundancy state:. Note The commands in this section are optional and can be used to customize your configuration. For most users, the default settings are adequate. Router configure terminal. Router config mls ip multicast sso convergence-time time.
Specifies the maximum time to wait for protocol convergence; valid values are from 0 to seconds. Router config mls ip multicast sso leak interval. Specifies the packet leak interval; valid values are from 0 to seconds. Router config mls ip multicast sso leak percentage.
Specifies the percentage of multicast flows; valid values are from 1 to percent. The value represents the percentage of the total number of existing PIM sparse mode and PIM dense mode multicast flows that should be flagged for packet leaking.
No configuration is necessary. Router config router bgp as-number. Enables a BGP routing process, which places the router in router configuration mode. Router config-router bgp graceful-restart. If you enter this command after the BGP session has been established, you must restart the session for the capability to be exchanged with the BGP neighbor.
Use this command on the restarting router and all of its peers. To verify, follow these steps:. Step 2 Repeat step 1 on each of the BGP neighbors. Step 3 On the SSO device and the neighbor device, verify that the graceful restart function is shown as both advertised and received, and confirm the address families that have the graceful restart capability.
Router config router ospf processID. Enables an OSPF routing process, which places the router in router configuration mode. Router config-router nsf. Step 2 Enter the show ip ospf command to verify that NSF is enabled on the device:. Router config router isis [ tag ].
Enables an IS-IS routing process, which places the router in router configuration mode. Router config-router nsf [ cisco ietf ]. Enter the ietf keyword to enable IS-IS in a homogeneous network where adjacencies with networking devices supporting IETF draft-based restartability is guaranteed. Router config-router nsf interval [ minutes ]. Optional Specifies the minimum time between NSF restart attempts.
The default time between consecutive NSF restart attempts is 5 minutes. Optional Specifies the time IS-IS will wait for the IS-IS database to synchronize before generating overloaded link-state information for itself and flooding that information out to its neighbors. The t3 keyword applies only if you selected IETF operation. When you specify adjacency , the router that is restarting obtains its wait time from neighboring devices.
Router config-router nsf interface wait seconds. The default is 10 seconds.
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