Which packet type is invalid for ospf

The neighbor then provides the requested link-state information in link-state update packets. During the adjacency, if a device receives an outdated or missing LSA, it requests that LSA by sending a link-state request packet. All link-state update packets are acknowledged. In this state, devices are fully adjacent with each other. All the device and network LSAs are exchanged and the devices' databases are fully synchronized.

Full is the normal state for an OSPF device. If a device is stuck in another state, it's an indication that there are problems in forming adjacencies. The only exception to this is the 2-way state, which is normal in a broadcast network. Neighbors always see each other as 2-way. The following is sample output from the show ip ospf nsf command. If this argument is used, only information for the specified OSPF routing process is included. The following sample output from the show ip ospf nsr command shows that OSPF on the standby RP is fully synchronized and ready to continue operation if the active RP fails or if a manual switchover is performed.

Optional Displays the list of all LSAs requested by the router on this interface from this neighbor. The following is sample output from the show ip ospf request-list command:. To display a list of all link-state advertisements LSAs waiting to be re-sent, use the show ip ospf retransmission-list command in EXEC mode. Optional Displays the list of all LSAs waiting to be re-sent on this interface, from this neighbor.

The following is sample output from the show ip ospf retransmission-list command:. Internally used identification parameter for an OSPF routing process. A unique value is assigned for each OSPF routing process. If the network-prefix and network-mask arguments are both entered, only the route that matches the network prefix and IP address mask is displayed. If only the network-prefix argument is entered, a longest prefix lookup is performed and the matching route is displayed.

The following example shows sample output from the show ip ospf sham-links command for a PE router in the VPN backbone:. Optional Displays statistics separately for each OSPF area and includes additional, more detailed statistics.

The show ip ospf statistics command provides important information about SPF calculations and the events that trigger them.

This information can be meaningful for both OSPF network maintenance and troubleshooting. For example, entering the show ip ospf statistics command is recommended as the first troubleshooting step for link-state advertisement LSA flapping.

The following is sample output from the show ip ospf statistics command that shows a single line of information for each SPF calculation:. Amount of time in milliseconds that has passed from when SPF started its calculation to the current time. Time in milliseconds for the SPF algorithm to process intra-area LSAs and install intra-area routes in the routing table.

Time in milliseconds for the SPF algorithm to delete invalid intra-area routes from the routing table. Time in milliseconds for the SPF algorithm to process interarea LSAs and install interarea routes in the routing table.

Time in milliseconds for the SPF algorithm to delete invalid interarea routes from the routing table. The following is sample output from the show ip ospf statistics command with the detail keyword entered to show the statistics separately for a specific area:.

The number increases by one for each SPF algorithm that is executed in the area. Time in milliseconds that has passed between the start of the SPF algorithm execution and the current time. Time in milliseconds requires to compute the first stage of the SPF algorithm to build a short path tree. The SPT time plus the time required to process links to stub networks equals the Intra time.

Total time is the sum of previous times excluding the SPT time, which is already included in the Intra time. LSID types:. The process-id argument can be entered as a decimal number or as an IP address format.

The following is sample output from the show ip ospf summary-address command:. The table below describes the significant fields shown in the displays. Type indicates the external type type 1 or type 2 that is a component of the summary. To display all of the link-state advertisements LSAs in the rate limit queue, use the show ip ospf timers rate-limit command in privileged EXEC mode.

The following is sample output from the show ip ospf timers rate-limit command:. If the process-id argument is included, only information for the specified routing process is displayed. When the show ip ospf traffic command is entered without any arguments, global OSPF traffic statistics are displayed, including queue statistics for each OSPF process, statistics for each interface, and per-OSPF process statistics. You can limit the displayed traffic statistics to those for a specific OSPF process by entering a value for the process-id argument, or you can limit output to traffic statistics for a specific interface associated with an OSPF process by entering values for the interface-type and interface-number arguments.

To reset counters and clear statistics, use the clear ip ospf traffic command. Traffic statistics accumulated for all OSPF processes running on the router. To ensure compatibility with the show ip traffic command, only checksum errors are displayed. Identifies the route map name. Packet appears in this section if it was discarded because of an error in the header of an OSPF packet.

The discarded packet is counted under the appropriate discard reason. Number of packets dropped due to TTL security check is displayed if that feature has been configured. The following is sample output from the show ip ospf traffic command. The output has been modified to include the number of packets dropped due a TTL security check. To start collecting new statistics, reset the counters and clear the traffic statistics by entering the clear ip ospf traffic command as follows:. The information displayed by the show ip ospf virtual-links command is useful in debugging OSPF routing operations.

The following is sample output from the show ip ospf virtual-links command:. The number used here is the number assigned administratively when the OSPF routing process is enabled. Optional Rate-limited link-state advertisements LSAs. This keyword displays LSAs that are currently being rate limited, together with the remaining time to the next generation. The rate-limit keyword was added.

The following is sample output from the show ipv6 ospf command:. The following sample output shows the show ipv6 ospf command with area encryption information:. Displays the encryption algorithm in this case, null, meaning no encryption algorithm is used , the authentication algorithm SHA-1 , and the security policy index SPI value The following example shows information about LSAs that are currently being rate limited:. When the show ipv6 ospf traffic command is entered without any arguments, global OSPF traffic statistics are displayed, including queue statistics for each OSPF process, statistics for each interface, and per OSPF process statistics.

To reset counters and clear statistics, use the clear ipv6 ospf traffic command. The following example shows the display output for the show ipv6 ospf traffic command for OSPFv The network administrator wants to start collecting new statistics, resetting the counters and clearing the traffic statistics by entering the clear ipv6 ospf traffic command as follows:.

Packet appears in this section if it was discarded because of an error in the header of an OSPFv3 packet. The following example shows sample output from the show ospfv3 multi-area command:. The number used here is the number assigned administratively when enabling the OSPFv3 routing process and can be a value from 1 through The virtual routing and forwarding table for which the information should be displayed.

If this parameter is not specified, only information for the global routing table is shown. If you enter vrf vrf-instance-name with the show tech-support ospf command, the following commands are executed for the specified VRF:.

If you do not enter vrf vrf-instance-name with the show tech-support ospf command, show ip route summary and show ip route ospf are executed for the default VRF. If you enter the detail keyword with the show tech-support ospf command, the OSPF-related show commands are run to provide more detailed output. However, the detail keyword has no effect on the output of show ip route summary and show ip route ospf.

This command generates tech-support information that is useful for Cisco Technical Support representatives when troubleshooting OSPF issues on a router. This command can generate a very large amount of output.

You may want to redirect the output to a file using the file send-to keyword and argument. Redirecting the output to a file also makes sending the output to your Cisco Technical Support representative easier. The following show commands run automatically when you run the show tech-support ospf command:.

To initiate a graceful shutdown of the Open Shortest Path First OSPF protocol under the current instance, use the shutdown command in router configuration mode. To restart the OSPF protocol, use the no form of this command.

Use the shutdown command in router configuration mode to temporarily shut down a protocol in the least disruptive manner and to notify its neighbors that it is going away. All traffic that has another path through the network will be directed to that alternate path. The following example shows how to enable a graceful shutdown of the OSPF protocol:. Initiates a graceful shutdown on a specific OSPF interface.

Limits the number of OSPF traps that are sent during a specified number of seconds. To enable the SNMP notifications for OSPF configuration errors for both virtual and nonvirtual interfaces, enter the snmp-server enable traps ospf cisco-specific errors command in global configuration mode without the optional keywords. The following example enables the router to send OSPF configuration mismatch errors only for nonvirtual interfaces:.

To enable the cospfShamLinkConfigError trap, you must first enter the snmp-server enable traps ospf cisco-specific errors config-error command in global configuration mode. The snmp-server enable traps ospf cisco-specific errors config-error command enables the cospfConfigError trap, so that both traps can be generated at the same place and maintain consistency with a similar case for configuration errors across virtual links.

If you try to enable the cospfShamLinkConfigError trap before configuring the cospfospfConfigError trap you will receive an error message stating you must first configure the cospfConfigError trap. The following example enables the router to send nonvirtual interface mismatch error notifications to the host at the address myhost.

Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book. PDF - Complete Book 3. Updated: August 19, This command was introduced.

S Release. Support for displaying packet pacing timers was added. T Release. This command was modified to show packet pacing timers in the displayed output. Support for the BFD feature was added. Number of types of service supported Type 0 only. SPF schedule delay. Delay time in seconds of SPF calculations. Minimum LSA interval. Minimum interval in seconds between link-state advertisements.

LSA group pacing timer. Configured LSA group pacing timer in seconds. Interface flood pacing timer. Configured LSA flood pacing timer in milliseconds. Retransmission pacing timer. Configured LSA retransmission pacing timer in milliseconds. Number of external LSA. Number of external link-state advertisements. Number of opaque link-state advertisements. Number of demand circuit external and opaque link-state advertisements.

Number of do not age external and opaque link-state advertisements. Number of areas in this router is. Number of areas configured for the router. External flood list length.

BFD is enabled. OSPF area and tag. Number of interfaces Number of interfaces configured in the area. It is Possible types are internal, area border, or autonomous system boundary.

Initial SPF schedule delay. Delay time of SPF calculations at startup. Minimum hold time. Minimum hold time in milliseconds between consecutive SPF calculations. Maximum wait time. Maximum wait time in milliseconds between consecutive SPF calculations. Status of incremental SPF calculations. Minimum LSA Number of Number and type of link-state advertisements that have been received. Number of areas configured for the router listed by type. Number of Types of Service supported.

Possible types are internal, area border, or autonomous system boundary router. Redistributing External Routes from. Lists of redistributed routes, by protocol. Maximum limit of redistributed prefixes. Threshold for warning message. Minimum hold time between two consecutive SPFs.

Maximum wait time between two consecutive SPFs. Number of areas. Number of areas in router, area addresses, and so on. Number of TOS supported. Possible types are internal, area border, or autonomous system boundary routers. Router ID of the destination. Cost of using this route. Next hop toward the destination.

Interface type for the outgoing interface. The area ID of the area from which this route is learned. SPF 3. Optional Displays information only about the external LSAs. Optional Displays information only about the network LSAs. Optional Displays information only about the router LSAs. Optional Displays only self-originated LSAs from the local router. Optional Displays information only about the summary LSAs.

The following keywords were added: self-originate adv-router. Link ID. Router ID number. ADV Router. Link state age. Link state sequence number detects old or duplicate link state advertisements.

Fletcher checksum of the complete contents of the link state advertisement. Link count. Number of interfaces detected for router. OSPF Router with id. Process ID. LS age. Type of service options Type 0 only. Default: Disabled. Command Mode: Route map configuration.

Example: In the following example, the metric type of the destination protocol is set to OSPF external type 1: route-map map-type set metric-type type-1 Related Commands: match as-path set as-path match community-list set automatic-tag match interface set community match ip address set level match ip next-hop set local-preference match ip route-source set metric match metric set next-hop match route-type set origin match tag set tag route-map set weight summary-address Use the summary-address router configuration command to create aggregate addresses for IS-IS or OSPF.

Summary address designated for a range of addresses. IP subnet mask used for the summary route. This keyword does not apply to OSPF. The summary router is injected into both a Level 1 area and a Level 2 subdomain. IP route prefix for the destination. The syntax for this command and the no form is as follows: timers spf spf-delay spf-holdtime no timers spf spf-delay spf-holdtime Syntax Description: spf-delay.

It can be an integer from 0 to 65, The default time is 5 seconds. A value of 0 means that there is no delay; that is, the SPF calculation is started immediately. Minimum time, in seconds, between two consecutive SPF calculations. The default time is 10 seconds. A value of 0 means that there is no delay, that is, two consecutive SPF calculations can be done one immediately after the other. Router Command Mode: Router configuration.

Previous Table of Contents Next. It is important to complete these steps in order:. Change the cable between the routers. In the previous example, this would be the router that sends the bad packet If the previous step does not fix the problem, use a different port on the switch in between the routers. If the previous step does not fix the problem, connect the routers directly using a crossover cable whenever physical location allows.

If you receive no further messages, the switch is most likely corrupting the packet. The router generating this message received a packet from This message is only generated once for a non-OSPF interface.

This problem is rarely seen on a router. To solve this problem, make sure OSPF is enabled on the interface. Try re-entering the network statement in the router configuration. To verify if OSPF is enabled on the interface mentioned above, type the following command:.