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Chapter 10
Configuring and Monitoring IP Tunneling
This chapter describes the IP tunneling configuration and monitoring commands. It includes the following sections:
Tunneling and Multicast Packets
IP Tunnel Commands 141
Tunneling and Multicast Packets
For tunnel configurations where multicast packets are involved, the source address of the multicast packets must lie on a network segment that is capable of the Internet Group Management Protocol (IGMP).
IGMP is not defined on X.25 or Frame Relay configurations, so when running multicast applications on the router (e.g., the MOSPF tunnel) take care if one of the following conditions hold:
You can ensure the first condition by using the IP set router-id configuration command. You can ensure the second condition by using the IP set internal-ip-address configuration command.
In all cases, the second option is preferable. Use the first only if some of the routers in the network do not like host addresses (this might happen in mixed vendor networks).
IP Tunnel Commands
Enter commands for specifically defined tunnels at the Tunnel(#)config> prompt. To get this prompt enter tunnel at the ASRT config> or ASRT> prompt. Table 10-1 lists the tunnel commands.
? (Help) C M
Lists the commands available from the current prompt level. After a specific command lists its options.
Syntax: ?
Example: list ?
Add C
Adds the IP address of endstations participating in a unicast or multicast IP addressing configuration.
For IP unicast addressing, the tunneling configuration requires you to supply IP addresses of destination bridges. The router software uses this record to convert the segment number in the RIF (Routing Information Field) in a source-routed frame to the corresponding IP address of the destination bridge. For transparent bridging frames, the record identifies the other end point of the tunnel.
For IP multicast addressing, the tunneling configuration requires only the IP multicast address reserved for tunneling. Encapsulation uses three groups of IP multicast addresses. The first group is for sending ARE frames, the second group for sending STE frames, and the third group for SRF.
Note: The bridging software transparently differentiates between unicast and multicast addresses.
Syntax: add address IP-address
Example: add address 128.185.144.37
Delete C
Deletes the IP address of bridges participating in a unicast or multicast IP addressing configuration.
Syntax: delete address IP-address
Example: delete address 128.185.144.37
Exit C M
Use the exit command to return to the ASRT config> or ASRT> prompt.
Syntax: exit
Example: exit
Join C
Establishes the router as a member of one or more multicast groups. A tunnel group can be a peer, client, or server, and is defined by an integer tag. A bridge can belong to only one group type for each tag. A bridge cannot belong, for example, to both peer group 1 and server group 1.
Syntax: join
- server-group
- client-group
- peer-group
server-group group-number
Makes the router a member of the server group with the group number.
Example: join server-group 7
client-group group-number
Makes the router a member of the client group with the group number.
Example: join client-group 3
peer-group group-number
Makes the router a member of the peer group with the group number.
Example: join peer-group 5
Leave C
Removes the router from membership in multicast groups.
Syntax: leave
- server-group
- client-group
- peer-group
server-group group-number
Removes the router from membership in the server group with the given group number.
Example: leave server-group 7
client-group group-number
Removes the router from membership in the client group with the given group number.
Example: leave client-group 3
peer-group group-number
Removes the router from membership in the peer group with the given group number.
Example: leave peer-group 5
List C M
Displays the IP addresses of bridges participating in an IP unicast or multicast addressing configuration for tunneling over IP. Displays the current size of IP packets being sent through the tunnels and whether or not IP is enabled or disabled.
List C
Displays the IP addresses of bridges participating in an IP unicast or multicast addressing configuration for tunneling over IP.
Syntax: list
- address
- all
address
Lists the IP addresses of bridges participating in an IP unicast or multicast addressing configuration for tunneling over IP.
Example: list address
IP Tunnel Addresses
128.185.179.51 128.185.170.51 128.185.142.39 128.185.143.39 224.0.0.5
all
Lists all unicast IP addresses, configured multicast addresses, and the tunnel packet size.
Example: list all
IP Tunnel Addresses
128.185.179.51 128.185.170.51 128.185.142.39
128.185.143.39 224.0.0.5
Frame size for the tunnel 2120
Frame size for the tunnel 2120
List M
Displays the IP addresses of bridges participating in an IP unicast or multicast addressing configuration for tunneling over IP.
Syntax: list
- tunnel
tunnel bridges or config
Use the bridges option to list the source routing segment and address of bridges. Use the config option to list the tunnel configuration.
Example: list tunnel bridges
SR segment IP address
Set M
Sets the base multicast IP address of the router for multicast tunneling.
Syntax: set
- base-multicast-address
Example: set base-multicast-address 224.10.0.0
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