3Com SuperStack 4 Configuration Manual page 150

162 C 6: IP R
HAPTER OUTING
Troubleshooting Routing
Protocols
Route Capacity
Configuration
P O
ROTOCOL PERATION
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
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
■
mode. When a Route Policy is used for the routing information
permit
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
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
■
mode. The list items of the
permit
filter the routing information not satisfying the requirement, but if all the items
are in the deny mode, no routes will not pass the
define an item of permit 0.0.0.0/0
in the mode so as to let all the other routes pass the filtering (If
deny
32 is not specified, only the default route will be matched).
less-equal
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.
mode can be firstly defined to rapidly
deny
ip-prefix
32 after the multiple list items
less-equal
mode,
deny
filtering. You can