Type 10 LSA – Opaque LSA

This LSA is an extension of OSPF. The extension is for doing OSPF traffic engineering.

MAX-LSA – Protects against adjacent router’s excessive LSA in the OSPF domain. Excessive LSA will cost router’s high cpu resources. This is to limit the LSA that is not generated by the router itself.


r1(config)#router ospf 1
r1(config-router)#max-lsa ?
 <1-4294967294> Maximum number of non self-generated LSAs this process can
 receive

r1(config-router)#max-lsa 100000
r1(config-router)#
*Mar 3 16:25:25.569: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on FastEthernet0/0 from FULL to DOWN, Neighbor Down: Interface down or detached
*Mar 3 16:25:25.569: %OSPF-5-ADJCHG: Process 1, Nbr 3.3.3.3 on FastEthernet0/0 from FULL to DOWN, Neighbor Down: Interface down or detached
r1(config-router)#
*Mar 3 16:25:35.622: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on FastEthernet0/0 from LOADING to FULL, Loading Done
r1(config-router)#
*Mar 3 16:25:37.305: %OSPF-5-ADJCHG: Process 1, Nbr 3.3.3.3 on FastEthernet0/0 from LOADING to FULL, Loading Done
r1(config-router)#

CAUTION: Router adjacency will be affected after max-lsa is specified!

OSPF LSA throttling – This is to slow down LSA updates during network instability. Also allows faster convergence by providing LSA rate limiting in milliseconds.


r1(config-router)#timers pacing flood ?
 <5-100> The minimum interval in msec to pace limit flooding on interface

r1(config-router)#timers pacing flood 20
r1(config-router)#

Default rate limit in milliseconds is 33ms. Controls the rate at which LSA updates occur.


r1(config-router)#timers throttle lsa all 0 6000 6000
r1(config-router)#

Sets the rate limiting interval in milliseconds for LSA generation. The parameters are as follow:

1. Delay to generate first occurrence of LSA in milliseconds.

2. Minimum delay between the originating same LSA in milliseonds.

3. Maximum delay between the originating same LSA in milliseconds.

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