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This chapter describes the commands needed for configuring snapshot routing on the router.
The router can be configured to exchange routing updates each time the line protocol goes from "down" to "up" or from "dialer spoofing" to "fully up." The router can also be configured to dial the server router in the absence of regular traffic if the active period time expires.
Snapshot routing is useful in two command situations:
For configuration tasks and examples, refer to the "Configuring Snapshot Routing" chapter in the Dial Solutions Configuration Guide.
To end the quiet period on a client router within two minutes, use the clear snapshot quiet-time EXEC command.
clear snapshot quiet-time interface| interface | Interface type and number. |
EXEC
This command first appeared in Cisco IOS Release 10.3.
The clear snapshot quiet-time command places the client router in a state to reenter the active period within 2 minutes. The 2-minute hold period ensures a quiet period of at least 2 minutes between active periods.
The following example ends the quiet period on dialer interface 1:
clear snapshot quiet-time dialer 1
You can use the master indexes or search online to find documentation of related commands.
To define a dialer map for Cisco's snapshot routing protocol on a client router connected to a DDR interface, use the dialer map snapshot interface configuration command. To delete one or more previously defined snapshot routing dialer maps, use the no form of this command.
dialer map snapshot sequence-number dial-string| sequence-number | A number in the range from 1 to 254, inclusive, that uniquely identifies a dialer map. |
| dial-string | Telephone number of a remote snapshot server to be called during an active period. |
No snapshot routing dialer map is defined.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
Enter a command for each remote snapshot server router the client router should call during an active period.
Use the no dialer map snapshot form of this command to remove all previously defined snapshot dialer maps on the client router; use the no dialer map snapshot sequence-number form of this command to delete a specified dialer map.
The following examples define snapshot dialer maps on a client router:
dialer map snapshot 12 4151231234 dialer map snapshot 13 4151231245
The following example removes one of the previously defined snapshot routing dialer maps on the client router:
no dialer map snapshot 13
You can use the master indexes or search online to find documentation of related commands.
dialer rotary-group
interface dialer
snapshot client
To display snapshot routing parameters associated with an interface, use the show snapshot EXEC command.
show snapshot [type number]| type number | (Optional) Interface type and number. |
EXEC
This command first appeared in Cisco IOS Release 10.3.
The following is sample output from the show snapshot command:
Router# show snapshot serial 1
Serial1 is up, line protocol is up, snapshot up
Options: dialer support
Length of each activation period: 3 minutes
Period between activations: 10 minutes
Retry period on connect failure: 10
For dialer address 240
Current queue: active, remaining active time: 3 minutes
Updates received this cycle: ip, ipx, appletalk
For dialer address 1
Current queue: client quiet, time until next activation: 7 minutes
Table 124 describes the fields shown in the display.
| Field | Description |
|---|---|
| Serial1 is up, line protocol is up | Indicates whether the interface hardware is currently active (whether carrier detect is present) and if it has been taken down by an administrator. |
| snapshot up | Indicates whether the snapshot protocol is enabled on the interface. |
| Options: | Option configured on the snapshot client or snapshot server interface configuration command. It can be one of the following:
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|
Length of each activation period | Length of the active period. |
| Period between activations | Length of the quiet period. |
| Retry period on connect failure | Length of the retry period. |
| For dialer address | Displays information about each dialer rotary group configured with the dialer map command. |
| Current queue: | Indicates which period snapshot routing is currently in. It can be one of the following:
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remaining active time | Time remaining in the current period. |
| Updates received this cycle | Protocols from which routing updates have been received in the current active period. This line is displayed only if the router or access server is in an active period. |
To configure a client router for snapshot routing, use the snapshot client interface configuration command. To disable a client router, use the no form of this command.
snapshot client active-time quiet-time [suppress-statechange-updates] [dialer]| active-time | Amount of time, in minutes, that routing updates are regularly exchanged between the client and server routers. This can be an integer in the range 5 to 100. There is no default value. A typical value is 5 minutes. |
| quiet-time | Amount of time, in minutes, that routing entries are frozen and remain unchanged between active periods. Routes are not aged during the quiet period, so they remain in the routing table as if they were static entries. This argument can be an integer from 8 to 100000. There is no default value. The minimum quiet time is generally the active time plus 3. |
| suppress-statechange-updates | (Optional) Disables the exchange of routing updates each time the line protocol goes from "down" to "up" or from "dialer spoofing" to "fully up." |
| dialer | (Optional) Used if the client router has to dial up the remote router in the absence of regular traffic. |
Snapshot routing is disabled.
The active-time and quiet-time arguments have no default values.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
The value of the active-time argument must be the same for the client and server routers.
To specify the remote server routers to be called by this client router during each active period, use the dialer map snapshot command.
The following example configures a client router for snapshot routing:
interface dialer 1 snapshot client 5 600 suppress-statechange-updates dialer
You can use the master indexes or search online to find documentation of related commands.
clear snapshot quiet-time
dialer map snapshot
show snapshot
snapshot server
To configure a server router for snapshot routing, use the snapshot server interface configuration command. To disable a server router, use the no form of this command.
snapshot server active-time [dialer]| active-time | Amount of time, in minutes, that routing updates are regularly exchanged between the client and server routers. This can be an integer in the range 5 to 100. There is no default value. A typical value is 5 minutes. |
| dialer | (Optional) Allows the client router to dial up the remote router in the absence of regular traffic. |
Snapshot routing is disabled.
The active-time argument has no default value.
Interface configuration
This command first appeared in Cisco IOS Release 10.3.
The value of the active-time argument must be the same for the client and server routers.
The following example configures a server router for snapshot routing:
interface dialer 1 snapshot server 5
You can use the master indexes or search online to find documentation of related commands.
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