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The show ospf commands display extensive information about the OSPF database, configuration, and dynamic memory usage.
show ospf {rtrid | config | stats | mem | nbr | rt | all | if [verbose] |
rtrid | The show ospf rtrid command displays the router ID, which is the largest IP interface address associated with the router. The router ID is calculated only at boot time, or when OSPF has been re-enabled using the ospfenable command (see ospfenable). |
config | The show ospf config command displays user-configured values that are currently being used by the protocol. |
stats | The show ospf stats command shows OSPF packet statistics. |
mem | The show ospf mem command displays OSPF dynamic memory usage. |
nbr | The show ospf nbr command displays an abbreviated list of current neighbors and their state. |
rt | The show ospf rt command displays the ABR (Area Border Router) and ASBR (Autonomous System Border Router) routes. An Area Border Router is a router which has interfaces in more than one area. An Autonomous System Border Router is a router which acts as a gateway between OSPF and other routing protocols (e.g., RIP, BGP, etc.). |
all | The show ospf all command displays the entire OSPF Link State Database. |
if [verbose] | The show ospf if command displays the OSPF interface database. The verbose option can be used to display more information. |
db [all | rtr | net | sum | ext] | The show ospf db commands display various portions of the OSPF Link State Database.
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The following sections describe the display contents for each command.
The show ospf config command displays configured settings for each interface, including the IP address of the interface, the area the interface is assigned to, and whether the interface is an active or passive OSPF interface. The display also includes any configured settings for OSPF virtual links, the Area ID and any net ranges set for the area and the routing protocol redistribution settings.
Interface Cost | This is the configured cost assigned to this interface. |
Router Priority | This is the configured priority assigned to this interface. |
Hello Interval | This is the interval, in seconds, the interface sends out "keepalive" packets to let other routers know this interface is up. |
Router Dead Interval | This is the interval, in seconds, the router's neighbors will wait without receiving a "keepalive" packet from this router before they assume this router is down. |
Transit Delay | This is the amount of time added to the age of Link State Update packets before transmission. |
Retransmit Interval | This is the interval, in seconds, the interface will delay before retransmitting Link State Update packets. |
The show ospf stats command shows how many of each of the five types of OSPF packets have been received and sent: Hello, Database Description, Link State Request, Link State Update, and Link State Acknowledgment. Discarded packets are not errors; an example of a discarded packet would be a multicast for Designated Routers when this router is not the Designated Router or Backup Designated Router. If "Packet errors" is nonzero, a detailed breakdown of each type of packet error will be displayed.
The show ospf if display includes:
Cost | This is the cost of using this interface. An OSPF router will choose the path with the lowest cost to enter into its routing table. |
State | This indicates whether this router is the Designated Router or the Backup Designated Router. |
Type | This indicates the interface's type. Broadcast interfaces are LAN/Ethernet interfaces. Point-to-Point interfaces are WAN interfaces running PPP. Point-to-Multipoint interfaces are WAN interfaces running Frame Relay. |
Priority | This indicates the router's priority. The priority is used to determine whether the router is eligible to become the Designated Router or the Backup Designated Router for the LAN. A priority of 0 means that the router is not eligible. The router with the highest priority becomes the Designated Router. |
Designated Router | This is the IP address of the Designated Router. |
Backup Designated Router | This is the IP address of the Backup Designated Router. |
Timers | This displays the timer settings for this interface. The Hello and Dead timers for each connected router must match or the routers will not be able to communicate. |
Neighbors | This shows the number of current neighbors in each state of the neighbor negotiation process. Down, Att (attempting connection), Init (initializing connection), ExStart (starting to exchange database information), Exch (in the process of exchanging database information), and Loading (requesting Link State Advertisements from each other) are transient states and should only appear at startup. 2WAY indicates that this router and the neighbor have completed their neighbor negotiation. FULL indicates that the neighbor is the Designated Router or the Backup Designated Router. |
The show ospf nbr display includes:
Rrt ID | This is the neighbor's router ID, which is the largest IP interface address associated with the router. |
Addr | This is the IP address of the neighbor. |
State | This is the current state of the neighbor negotiation process between this router and the neighbor. Unless the router is just starting up, the state should either be 2WAY or FULL. FULL indicates that the neighbor is the Designated Router or the Backup Designated Router. 2WAY indicates that this router and the neighbor have completed their neighbor negotiation. |
The following sections show an example for each command.
Following is sample output from a show ospf rtrid command.
OSPF Router ID for this router is 198.41.11.202
Following is sample output from a show ospf config command.
OSPF PER-INTERFACE CONFIGURATION
IP Ethernet Intface 198.41.11.201 assign to area 0.0.0.0
Interface is Active
Interface Cost = 10, Router Priority = 1
Hello Interval = 10, Router Dead Interval = 40
Transit Delay = 1, Retransmit Interval = 5
IP Ethernet Interface 74.0.0.1 assigned to area 0.0.0.0
Interface is Active
Interface Cost = 10, Router Priority = 1
Hello Interval = 10, Router Dead Interval = 40
Transit Delay = 1, Retransmit Interval = 5
IP Ethernet Interface 73.0.0.1 assigned to area 0.0.0.0
Interface is Active
Interface Cost = 10, Router Priority = 1
Hello Interval = 10, Router Dead Interval = 40
Transit Delay = 1, Retransmit Interval = 5
IP Ethernet Interface 77.0.0.1 assigned to area 0.0.0.0
Interface is Active
Interface Cost = 10, Router Priority = 1
Hello Interval = 10, Router Dead Interval = 40
Transit Delay = 1, Retransmit Interval = 5
OSPF VIRTUAL LINK CONFIGURATION
None
OSPF AREA CONFIGURATION
Area ID: 0.0.0.0
Net Ranges defined for this area:
None
ROUTING PROTOCOL REDISTRIBUTION
Redistribute RIP routes into OSPF is disabled
Redistribute BGP routes into OSPF is disabled
Redistribute OSPF routes into RIP is disabled
Following is sample output from a show ospf mem command.
------------------------------------------------------------
OSPF DATABASE STATIC MEMORY USAGE: 36882 bytes
OSPF DATABASE DYNAMIC MEMORY USAGE
Memory Block Allocs Deallocs In Use Size Total
------------------------------------------------------------
ospf_intf 2 0 2 874 1748
ospf_nbr 4 0 4 118 472
ospf_nbr_node 4 0 4 20 80
ospf_nh_block 4 0 4 20 80
ospf_lsdb 419 323 96 74 7104
ospf_rtr_lsa 178 173 5 var 216
ospf_stub_lsa 2 0 2 24 48
ospf_net_lsa 36 35 1 var 44
ospf_sum_lsa 350 340 10 28 280
ospf_ase_lsa 3027 2949 78 36 2808
ospf_route 6 4 2 46 92
ospf_netrange 0 0 0 28 0
ospf_rtinfo 82 2 30 80 2400
ospf_dbsum 6 6 0 12 0
ospf_hdr 6 6 0 1422 0
ospf_ack_hdrq 156 156 0 28 0
ospf_ack_intf 3503 3503 0 28 0
ospf_nbrlist 70 70 0 12 0
ospf_lsreq 94 94 0 24 0
ospf_lsdblist 3660 3660 0 16 0
------------------------------------------------------------
Total In Use 15130
------------------------------------------------------------
Following is sample output from a show ospf stats command.
OSPF Packet Statistics
Received Sent
Hello Packets: 29371 5880
Database Description Packets: 13 16
Link State Request Packets: 0 9
Link State Update Packets: 327 34
LS Acknowledgment Packets: 275 279
Total Packets: 30811 6218
Packets discarded: 825
Packet errors: 0
In the example below, the router is reporting a Hello timer interval mismatch with one of the routers on the network, which will cause the two routers to be unable to establish an adjacency.
OSPF Packet Statistics
Received Sent
Hello Packets: 26 19
Database Description Packets: 11 11
Link State Request Packets: 1 4
Link State Update Packets: 17 4
LS Acknowledgment Packets: 6 10
Total Packets: 63 48
Packets discarded: 0
Packet errors: 2
Hello timer mismatch: 2
Following is sample output from a show ospf if command.
OSPF IP Interfaces
Interface Ether0 is Active
Cost: 5 State: NOT DR OR BDR Type: BROADCAST
Priority: 1
Designated Router: 198.41.11.205
Backup Designated Router: 198.41.11.204
Timers: Hello: 10 Dead: 40 Retrans: 5
Neighbors:
Down 0 Att 0 Init 0 2Way 3 ExStart 0 Exch 0 Loading 0 Full 2
Interface Ether1 is Active
Cost: 5 State: NOT DR OR BDR Type: BROADCAST
Priority: 1
Designated Router: 198.41.11.17
Backup Designated Router: 198.41.11.6
Timers: Hello: 10 Dead: 40 Retrans: 5
Neighbors:
Down 0 Att 0 Init 0 2Way 0 ExStart 0 Exch 0 Loading 0 Full 2
Following is sample output from a show ospf nbr command.
----------------------------------------------------------------- OSPF Neighbors ================================================================= Ether0 RtrID: 198.41.11.200 Addr: 198.41.11.200 State: 2WAY Ether0 RtrID: 198.41.11.202 Addr: 198.41.11.202 State: 2WAY Ether0 RtrID: 198.41.11.203 Addr: 198.41.11.203 State: 2WAY Ether0 RtrID: 198.41.11.204 Addr: 198.41.11.204 State: FULL Ether0 RtrID: 198.41.11.205 Addr: 198.41.11.205 State: FULL Ether1 RtrID: 198.41.11.6 Addr: 198.41.11.6 State: FULL Ether1 RtrID: 198.41.11.17 Addr: 198.41.11.17 State: FULL -----------------------------------------------------------------
Following is sample output from a show ospf rt command.
AREA 0:
AS Border Routes:
None
Area Border Routes:
78.0.0.1 Area 0 Cost 10 AdvRouter 78.0.0.1
Nexthop: 75.0.0.5 Interface: 75.0.0.2
76.0.0.2 Area 0 Cost 10 AdvRouter 76.0.0.2
Nexthop: 75.0.0.3 Interface: 75.0.0.2
75.0.0.2 Area 0 Cost 0 AdvRouter 75.0.0.2
AREA 2:
AS Border Routes:
None
Area Border Routes:
75.0.0.2 Area 2 Cost 0 AdvRouter 75.0.0.2
SUMMARY AS Border Routes:
None
Following is sample output from a show ospf db command.
OSPF Router, Net and Summary Databases:
Area 10:
STUB AdvRtr: 198.41.11.202 Len: 24 Age: 3600 Seq: 00000000
Router: 198.41.11.192 Mask: 255.255.255.240 Network: 198.41.11.192
STUB AdvRtr: 198.41.11.202 Len: 24 Age: 2084 Seq: 00000000
Router: 79.0.0.0 Mask: 255.0.0.0 Network: 79.0.0.0
RTR AdvRtr: 198.41.11.193 Len: 36 Age: 1199 Seq: 80000d6b
RouterID: 198.41.11.193 Area Border: On AS Border: Off
Connect Type: TRANS NET Cost: 10
DR: 198.41.11.193 Address: 198.41.11.193
Nexthops(1):
198.41.11.193 Interface: 198.41.11.202
RTR AdvRtr: 198.41.11.194 Len: 36 Age: 393 Seq: 8000063f
RouterID: 198.41.11.194 Area Border: Off AS Border: Off
Connect Type: TRANS NET Cost: 10
DR: 198.41.11.193 Address: 198.41.11.194
Nexthops(1):
198.41.11.194 Interface: 198.41.11.202
NET AdvRtr: 198.41.11.193 Len: 44 Age: 1200 Seq: 80000034
Router: 198.41.11.193 Mask: 255.255.255.240 Network: 198.41.11.192
Attached Router: 198.41.11.193
Attached Router: 198.41.11.194
Attached Router: 198.41.11.200
Attached Router: 198.41.11.202
Attached Router: 198.41.11.203
Nexthops(1):
198.41.11.193 Interface: 198.41.11.202
SUM NET AdvRtr: 198.41.11.193 Len: 28 Age: 1486 Seq: 80000026
Network: 192.168.40.0 Mask: 255.255.255.0 Cost: 20
Nexthops(1):
198.41.11.193 Interface: 198.41.11.202
SUM NET AdvRtr: 198.41.11.193 Len: 28 Age: 1486 Seq: 80000026
Network: 192.168.41.0 Mask: 255.255.255.0 Cost: 20
Nexthops(1):
198.41.11.193 Interface: 198.41.11.202
SUM NET AdvRtr: 198.41.11.193 Len: 28 Age: 1486 Seq: 80000026
Network: 192.168.42.0 Mask: 255.255.255.0 Cost: 20
Nexthops(1):
198.41.11.193 Interface: 198.41.11.202
| Command | Description |
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configure IP | Configures IP parameters for an interface |
configure IP Protocol Precedence | Configures the precedence order for routes in the routing table |
configure OSPF Area | Configures OSPF area parameters |
configure OSPF Virtual Link | Configures OSPF to allow an area that is not contiguous to the backbone area (area 0) to operate |
ospfenable | Enables OSPF |
Posted: Wed Sep 27 11:39:29 PDT 2000
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