162 CHAPTER 6: IP ROUTING PROTOCOL OPERATION
2 Configure Switch B:
a Configure the IP address of VLAN interface.
[Switch B]interface vlan-interface 100
[Switch B-Vlan-interface100]ip address 10.0.0.2 255.0.0.0
b Configure the access control list.
[Switch B]acl number 2000
[Switch B-acl-basic-2000]rule deny source 30.0.0.0 0.255.255.255
[Switch B-acl-basic-2000]rule permit source any
c Enable OSPF protocol and specifies the number of the area to which the
interface belongs.
[Switch B]router id 2.2.2.2
[Switch B]ospf
[Switch B-ospf-1]area 0
[Switch B-ospf-1-area-0.0.0.0]network 10.0.0.0 0.255.255.255
d Configure OSPF to filter the external routes received.
[Switch B-ospf-1]filter-policy 2000 import
Troubleshooting Routing
Protocols
Routing information filtering cannot be implemented in normal operation of the
routing protocol
Check for the following faults:
■ The if-match mode of at least one node of the Route Policy should be the
permit mode. When a Route Policy is used for the routing information
filtering, if a piece of routing information does not pass the filtering of any
node, then it means that the route information does not pass the filtering of
the Route Policy. When all the nodes of the Route Policy are in the
deny mode,
then all the routing information cannot pass the filtering of the Route Policy.
■ The if-match mode of at least one list item of the ip-prefix should be the
permit mode. The list items of the deny mode can be firstly defined to rapidly
filter the routing information not satisfying the requirement, but if all the items
are in the deny mode, no routes will not pass the
ip-prefix filtering. You can
define an item of permit 0.0.0.0/0
less-equal 32 after the multiple list items
in the
deny mode so as to let all the other routes pass the filtering (If
less-equal 32 is not specified, only the default route will be matched).
Route Capacity
Configuration
In practical networking applications, there is always a large number of routes in
the routing table, especially OSPF routes. The routing information is usually stored
in the memory of the Ethernet switch. When the size of the routing table
increases, it can consume a significant amount of the switch memory.
To solve this problem, the Switch 5500G-EI provides a mechanism to control the
size of the routing table. This monitors the free memory in the system to
determine whether to add new routes to the routing table and whether or not to
keep connection with a routing protocol.
The default value normally meets the network requirements. You must be careful
when modifying the configuration to avoid reducing the stability of the network.
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