HP 5500 Ei 5500 Si Switch Series Configuration Guide

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calculated cost is greater than 65535, the value of 65535 is used. If the calculated cost is less than 
1, the value of 1 is used.  
If the cost value is not configured for an interfac e, OSPF computes the interface cost automatically. 
To configure an OSPF cost for an interface: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enter interface view.  interface
 interface-type 
interface-number   N/A
 
3.  Configure an OSPF cost 
for the interface.  ospf cost
 value
  Optional....

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Step Command Remarks 
2.  Enter OSPF view.  ospf 
[ process-id  | router-id  router-id  | 
vpn-instance  vpn-instance-name ] *  N/A 
3.
  Configure the maximum 
number of ECMP routes.  maximum load-balancing
 maximum
  Optional. 
8 by default.
 
 
Configuring OSPF preference 
A router can run multiple routing protocols, and each protocol is assigned a preference. When the 
routing protocols find routes to the same destinatio n, the route found by the protocol with the highest 
preference is selected...

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Step Command Remarks 
3.  Configure OSPF to 
redistribute routes from 
another protocol.  import-route 
protocol [ process-id  | 
all-processes  |  allow-ibgp  ] [ cost cost  | type  
type  | tag  tag | route-policy 
route-policy-name  ] *
  Not configured by default
4.
  Configure OSPF to filter 
redistributed routes before 
advertisement.  filter-policy 
{ acl-number  | ip-prefix  
ip-prefix-name  } export  [ protocol 
[ process-id  ] ]
  Optional 
Not configured by default
 
Configuring OSPF to...

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Step Command Remarks 
3.  Configure the default 
parameters for 
redistributed routes (cost, 
route number, tag, and 
type).  default 
{ cost  cost  | limit  limit  | tag  tag  | type 
type  } *  Optional. 
The default cost is 1, the 
default maximum number 
of routes redistributed per 
time is 1000, the default 
tag is 1, and default type 
of redistributed routes is 
Type-2.
 
 
Advertising a host route  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter OSPF view.  ospf 
[...

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•  Poll timer —Interval for sending hello packets to a neighbor that is down on the NBMA network. The 
poll interval is at least four times the hello interval. 
•   Dead timer—Interval within which if the interface receives no hello packet from the neighbor, it 
declares the neighbor is down. The  dead interval must be at least four times the hello interval on an 
interface. 
•   LSA retransmission timer —Interval within which if the interface receives no acknowledgement 
packets after sending an...

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Step Command Remarks 
3.  Specify the LSA transmission 
delay.   ospf trans-delay
 seconds
  Optional. 
1 second by default.
 
 
Specifying SPF calculation interval 
LSDB changes lead to SPF calculations. When the topology changes frequently, a large amount of 
network and router resources are occupied by SPF calculation. Adjust the SPF calculation interval to 
reduce the impact.  
When network changes are not frequent, the  minimum-interval is adopted. If network changes become 
frequent, the SPF...

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When network changes are not frequent, LSAs are generated at the  minimum-interval. If network 
changes become frequent, the LSA generation interval is incremented by  incremental-interval × 2n-2 (n 
is the number of generation times) each time a LSA generation occurs until the  maximum-interval is 
reached. 
To configure the LSA generation interval: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Enter OSPF view.  ospf 
[ process-id  | router-id  router-id  | 
vpn-instance...

 89 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter OSPF view.  ospf 
[ process-id  | router-id  router-id  | 
vpn-instance  vpn-instance-name  ] * N/A 
3.
  Configure the router as a 
stub router.  stub-router  By default, the router is not a stub 
router in any OSPF process.
 
 
Configuring OSPF authentication 
You can configure OSPF packet authentication to ensure the security of packet exchanges.  
After authentication is configured, OSPF only receives packets that pass...

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Step Command Remarks 
2.  Enter interface view.  interface
 interface-type 
interface-number   N/A
 
3.  Enable the interface to add its 
MTU into DD packets.  ospf mtu-enable  Optional. 
Not enabled by default.
 
 
Configuring the maximum number of external LSAs in LSDB  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter OSPF view.  ospf 
[ process-id  | router-id  router-id  | 
vpn-instance  vpn-instance-name ] *  N/A 
3.
  Specify the maximum number 
of external LSAs in...

 91 
Configuring OSPF network management 
With trap generation enabled, OSPF generates traps to report important events. Traps fall into the 
following levels. 
•  Level-3 —Fault traps 
•   Level-4 —Alarm traps  
•   Level-5 —Normal but important traps 
•   Level-6 —Notification traps 
The generated traps are sent to the information center of the device. The output rules of the traps such as 
whether to output the traps and the output direction  are determined according to the information center...