User guide

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11-7
IP M
ULTINETTING
To change the relative route priority, use the following command:
config iproute priority [rip | bootp | icmp | static | ospf-intra |
ospf-inter | ospf-as-external | ospf-extern1 | ospf-extern2] <priority>
IP M
ULTINETTING
IP multinetting is used in many legacy IP networks when there is need to overlap
multiple subnets onto the same physical segment. Though it can be a critical element in
a transition strategy, due to the additional constraints introduced in troubleshooting and
bandwidth, it is recommended that multinetting be used as a transitional tactic, and not
as a long-term network design strategy.
On the switch, each subnet is represented by a different VLAN, and each of those
VLANs has its own IP address. All of the VLANs share the same physical port(s). The
BlackDiamond switch or Summit switch routes IP traffic from one subnet to another, all
within the same physical port(s).
The following rules and comments apply when you are configuring IP multinetting:
• Multiple VLANs share the same physical ports; each of the VLANs is configured
with an IP address.
• A maximum of four subnets (or VLANs) on multinetted ports is recommended.
• All VLANs used in the multinetting application must share the same port
assignment.
• One VLAN is configured to use an IP protocol filter. This is considered the "primary"
VLAN interface for the multinetted group.
• The "secondary" multinetted VLANs can be exported using the
export direct
command.
ICMP 1200
OSPFIntra 2200
OSPFInter 2300
RIP 2400
OSPFExtern1 3200
OSPFExtern2 3300
BOOTP 5000
Table 11-1: Relative Route Priorities (continued)
Route Origin Priority