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Chapter 34
Configuring IP Unicast Routing
Configuring Stub Routing
The stub routing feature reduces resource usage by moving routed traffic closer to the end user. The
switch supports Protocol-Independent Multicast (PIM) stub routing and Enhanced Interior Gateway
Routing Protocol (EIGRP) stub routing.
Stub routing is explained in these sections:
•
•
•
•
Understanding PIM Stub Routing
The PIM stub routing feature reduces resource usage by moving routed traffic closer to the end user. In
a network using PIM stub routing, the only allowable route for IP traffic to the user is through a switch
that is configured with PIM stub routing. PIM passive interfaces are connected to Layer 2 access
domains, such as VLANs, or to interfaces that are connected to other Layer 2 devices. Only directly
connected multicast (IGMP) receivers and sources are allowed in the Layer 2 access domains. The PIM
passive interfaces do not send or process any received PIM control packets.
When using PIM stub routing, you should configure the distribution and remote routers to use IP
multicast routing and configure only the switch as a PIM stub router. The switch does not route transit
traffic between distribution routers. You also need to configure a routed uplink port on the switch. The
switch uplink port cannot be used with SVIs.
You must also configure EIGRP stub routing when configuring PIM stub routing on the switch. For more
information, see the
EIGRP Stub Routing" section on page
The redundant PIM stub router topology is not supported. The redundant topology exists when there is
more than one PIM router forwarding multicast traffic to a single access domain. PIM messages are
blocked, and the PIM assert and designated router election mechanisms are not supported on the PIM
passive interfaces. Only the nonredundant access router topology is supported by the PIM stub feature.
By using a nonredundant topology, the PIM passive interface assumes that it is the only interface and
designated router on that access domain.
In
Figure
on the VLAN 100 interfaces and on Host 3. This configuration allows the directly connected hosts to
receive traffic from multicast source 200.1.1.3. See the
page 34-24
OL-8915-03
Understanding PIM Stub Routing, page 34-23
Configuring PIM Stub Routing, page 34-24
Understanding EIGRP Stub Routing, page 34-26
Configuring EIGRP Stub Routing, page 34-27
"Understanding EIGRP Stub Routing" section on page 34-26
34-4, Switch A routed uplink port 25 is connected to the router and PIM stub routing is enabled
for more information.
34-27.
"Configuring PIM Stub Routing" section on
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring Stub Routing
and the
"Configuring
34-23
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