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Bring performance and reliability to your network with the Aruba Core, Aggregation, and Access layer switches. Discuss the latest features and functionality of the ArubaOS-Switch and ArubaOS-CX devices, and find ways to improve security across your network to bring together a mobile first solution.
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8320 - OSPF Summarize Address Advertisement

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  • 1.  8320 - OSPF Summarize Address Advertisement

    Posted Sep 30, 2021 04:42 AM
    Hi Folks, 

    Seeking you expertise, how can i advertise, or is this is the good practice. 
    The scenario is, the three sites are participating in OSPF area-0 (DC1, DC2 and Aruba 8320)

    Can we summarize the advertisement from 8320 into /21, take note that 8320 is only participating in AREA-0, no other OSPF area behind.
    If yes, what is the corresponding configuration, and If NO, why?



    Thanks In advance..


  • 2.  RE: 8320 - OSPF Summarize Address Advertisement

    Posted Oct 04, 2021 03:53 AM
    Hi,

    OSPF can summarise, but not within an area as OSPF can only summarise type 3  & 5  LSAs at the ABR or ASBR level.

    If you converted the 8320 to an ABR you could then summarise addressing ( providing there are no route address conflicts). You would have to check to see if this is practical.

    Regards,

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    Steve Bartlett
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  • 3.  RE: 8320 - OSPF Summarize Address Advertisement

    Posted Oct 04, 2021 01:38 PM
    Hello!

    OSPF is a link-state protocol and inside one single area (Area 0 in your example) it generates LSA for each link (and subnet associated with it). There is no way to summarize routes inside one area as summarization happens only on the border between areas (by ABR) or between autonomous systems (by ASBR) If you really need to perform such summarization, make another area behind CORE-SW and put your LAN Networks there. Thus CORE-SW will become an ABR and then it will summarize those networks towards DC1 and DC2 inside LSA Type 3 automatically.


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    Ivan Bondar
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  • 4.  RE: 8320 - OSPF Summarize Address Advertisement

    Posted Oct 04, 2021 01:43 PM
    Hello!

    OSPF is a link-state protocol and inside one single area (Area 0 in your example) it generates LSA for each link (and subnet associated with it). There is no way to summarize routes inside one area as summarization happens only on the border between areas (by ABR) or between autonomous systems (by ASBR) If you really need to perform such summarization, make another area behind CORE-SW and put your LAN Networks there. Thus CORE-SW will become an ABR and then it will summarize those networks towards DC1 and DC2 inside LSA Type 3 automatically.

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    Best regards,
    Ivan
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