The command outputs in the following section are examples only; actual displays may differ depending on supported functionality and user configuration.
This command displays information for a specified IS-IS instance.
This command displays information regarding IS-IS neighbors. When no ip-address, ip-int-name, or nbr-system-id is specified, then all adjacencies are displayed.
Standard and Detailed IS-IS Adjacency Output
The following table describes the standard and detailed command output fields for an IS-IS adjacency.
Label | Description |
Interface | Interface name associated with the neighbor. |
System-id | Neighbor’s system ID. |
Level | 1-L1 only, 2-L2 only, 3-L1 and L2. |
State | Up, down, new, one-way, initializing, or rejected. |
Hold | Hold time remaining for the adjacency. |
SNPA | Subnetwork point of attachment, MAC address of the next hop. |
Circuit type | Level on the interface L1, L2, or both. |
Expires In | Number of seconds until adjacency expires. |
Priority | Priority to become designated router. |
Up/down transitions | Number of times neighbor state has changed. |
Event | Event causing last transition. |
Last transition | Time since last transition change. |
Speaks | Supported protocols (only IP). |
IP address | IP address of neighbor. |
MT enab | Yes The neighbor is advertising at least 1 non MTID#0. |
Topology | Derived from the MT TLV in the IIH
Not supported MTIDs => Topology line suppressed |
This command displays the IS-IS capability information.
This command displays the entries in the IS-IS link state database.
This command displays the hostname database. There are no options or parameters.
IS-IS Hostname Output
The following table describes output fields for IS-IS hostname output.
Label | Description |
System-id | System identifier mapped to hostname. |
Hostname | Hostname for the specific system-id. |
Type | The type of entry (static or dynamic). |
This command shows IS-IS interface information. When no ip-addr or the ip-int-name is specified, all interfaces are listed.
IS-IS Interface Output
The following table describes IS-IS interface output fields.
Label | Description |
Interface | The interface name. |
Level | Specifies the interface level (1, 2, or 1 and 2). |
CirID | Specifies the circuit identifier. |
Oper State | Up The interface is operationally up. |
Down The interface is operationally down. | |
L1/L2 Metric | Interface metric for Level 1 and Level 2, if none are set to 0. |
This command displays IS-IS LFA coverage information.
This command displays IS-IS link-group-member status.
This command displays IS-IS link-group status.
This command displays IS-IS mapping-server information.
This command displays IS-IS prefix SIDs.
This command displays the routes in the IS-IS route table.
IS-IS Route Output
The following table describes IS-IS route output fields.
Label | Description |
Prefix | The route prefix and mask. |
Metric MT | The route’s metric. |
Lvl/Type | Specifies the level (1 or 2) and the route type, Internal (Int) or External (Ext). |
Version | SPF version that generated route. |
Nexthop | System ID of nexthop, give hostname if possible. |
Hostname | Hostname for the specific system-id. |
This command displays IS-IS SPF log information.
Router IS-IS SFP Log Output
The following table describes the IS-IS SPF log output fields.
Label | Description |
When | Displays the timestamp when the SPF run started on the system. |
Duration | Displays the time (in hundredths of a second) required to complete the SPF run. |
L1 Nodes | Displays the number of Level 1 nodes involved in the SPF run. |
L2 Nodes | Displays the number of Level 2 nodes involved in the SPF run. |
Event Count | Displays the number of SPF events that triggered the SPF calculation. |
Type | Displays the SPF type, Reg (regular) or Lfa (loop free alternative). |
Trigger LSP | Displays the LSP that triggered the SPF run. |
Reason | Displays the reason(s) for the SPF run. NEWADJ: An adjacency changed. NEWLSP: A new LSP was received. NEWAREA: An area changed. NEWREACH: A prefix changed. ECMPCHANGED: An ECMP path changed. NEWMETRIC: A prefix metric changed. RESTART: The graceful restart exited. LSPEXPIRED: An LSP expired. DBCHANGED: The LSP database was cleared by an administrator. LSPCONTENT: The content of an LSP changed. NEWPREF: The external route preference changed. NEWNLPID: The routed protocols (IPv4 or IPv6) changed. MANUALREQ: An SPF calculation was requested by an administrator. ADMINTAGCHANGED: An administrative tag changed. TUNNELCHANGED: An MPLS tunnel changed. |
This command displays information regarding IS-IS traffic statistics.
IS-IS Statistics Output
This table describes IS-IS statistics output fields.
Label | Description |
Purge Initiated | The number of times purges have been initiated. |
SPF Runs | The number of times shortest path first calculations have been made. |
LSP Regens | The count of LSP regenerations. |
Requests | The number of CSPF requests made to the protocol. |
Paths Found | The number of responses to CSPF requests for which paths satisfying the constraints were found. |
PDU Type | The PDU type. |
Received | The count of link state PDUs received by this instance of the protocol. |
Processed | The count of link state PDUs processed by this instance of the protocol. |
Dropped | The count of link state PDUs dropped by this instance of the protocol. |
Sent | The count of link state PDUs sent out by this instance of the protocol. |
Retransmitted | The count of link state PDUs that had to be retransmitted by this instance of the protocol. |
This command displays information regarding IS-IS status.
IS-IS Status Output
The following table describes IS-IS status output fields.
Label | Description |
System Id | The configured and operational IS-IS system ID. |
Router Id | The configured and operational IS-IS router ID. |
Admin State Oper State | Up IS-IS is administratively up. |
Down IS-IS is administratively down. | |
Ipv4 Routing | Enabled IPv4 routing is enabled. |
Disabled IPv4 routing is disabled. | |
Ipv6 Routing | Disabled IPv6 routing is disabled. |
Enabled, Native IPv6 routing is enabled. | |
Enabled, Multi-topology Multi-topology TLVs for IPv6 routing is enabled. | |
Multi-topology | Disabled Multi-topology TLVs for IPv6 routing is disabled. |
Enabled Multi-topology TLVs for IPv6 routing is enabled. | |
Last Enabled | The date/time when IS-IS was last enabled in the router. |
Level Capability | The routing level for the IS-IS routing process. |
Authentication Check | True All IS-IS mismatched protocol packets are rejected. |
False Authentication is performed on received IS-IS protocol packets but mismatched packets are not rejected. | |
Authentication Type | The method of authentication used to verify the authenticity of packets sent by neighboring routers on an IS-IS interface. |
Traffic Engineering | Enabled TE is enabled for the router. |
Disabled TE is disabled so that TE metrics are not generated and are ignored when received by this node. | |
Graceful Restart | Enabled Graceful restart is enabled for this instance of IS-IS on the router. |
Disabled Graceful restart capability is disabled for this instance of IS-IS on the router. | |
Ldp Sync Admin State | Indicates whether the IGP-LDP synchronization feature is enabled or disabled on all interfaces participating in the OSPF routing protocol. |
LFA NH Template | Indicates the LFA template that is applied for the configured LFA policies. |
LFA Policies | Indicates the configured LFA policies. |
Loopfree-Alternate | When enabled, excludes a prefix entry defined in the specified LFA policy from LFA calculation. |
The following sample output and detail sample output show LFA policies configured in the configure router isis context.
Displays IS-IS summary addresses.
Router IS-IS Summary Address Output
The following table describes the IS-IS summary address output fields.
Label | Description |
Address | The IP address. |
Level | Specifies the IS-IS level from which the prefix should be summarized. |
This command shows IS-IS topology information.
Router IS-IS Topology Output
The following table describes the IS-IS topology output fields.
Label | Description |
Node | Displays the IP address. |
Interface | Displays the interface name. |
Nexthop | Displays the nexthop IP address. |
LFA Interface | Displays the LFA interface name. |
LFA Nexthop | Displays the LFA nexthop IP address. |
This command enables the context to clear and reset IS-IS protocol entities.
This command clears and resets the entries from the IS-IS adjacency database.
This command removes the entries from the IS-IS link-state database which contains information about PDUs.
This command re-evaluates route policies participating in the export mechanism, either as importers or exporters of routes.
This command clears the IS-IS overload.
This command clears the SPF log.
This command clears and resets IS-IS statistics.
This command enables the context to debug IS-IS protocol entities.
Sample output for the command is shown below.
This command enables debugging for IS-IS adjacency.
The no form of the command disables debugging.
This command enables debugging for IS-IS cspf.
The no form of the command disables debugging.
This command enables debugging for IS-IS graceful-restart.
The no form of the command disables debugging.
This command enables debugging for IS-IS interface.
The no form of the command disables debugging.
This command enables debugging for IS-IS leaks.
The no form of the command disables debugging.
This command enables debugging for Link State DataBase (LSDB).
The no form of the command disables debugging.
This command enables debugging for IS-IS misc.
The no form of the command disables debugging.
This command enables debugging for IS-IS packets.
The no form of the command disables debugging.
This command enables debugging for IS-IS route table manager (RTM).
The no form of the command disables debugging.
This command enables debugging for IS-IS SFP.
The no form of the command disables debugging.