Re: [bess] Regarding the PE-Ce link failure

[chalapathi andhe <[e-mail]>]

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> Hi All,
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> Can you please help to understand the following behavior ? The following
> topology is for a Single Active Multi-homing scenario where PE1 is the DF.
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> In this topology, when PE1-CE1 link is failed, PE1 sends the EAD/ES route
> withdraw and PE3 updates its forwarding state to point towards PE2,
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> which means at PE3 any packet destined to the MAC [learnt from PE1] will
> go through PE2 [will not be flooded].
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> And later it is expected that the PE1 will start sending the MAC withdraw
> to PE3, and in the meantime PE2 might start sending the MAC add to PE3.
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> However in case of a quick link flap between PE1-CE1, what is the expected
> behavior from PE1 ?
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> 1). First it sends the EAD/ES withdraw, and then before it start sending
> the EAD/ES add, does it required to send the MAC delete for all the MAC’s ?
> and send the MAC add again for all the MAC’s Or
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> 2). First sends the EAD/ES withdraw, and few MAC deletes, and again send
> all the MAC’s add
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> In quick flap scenario’s, when should PE3’s MAC entries should point back
> to PE1 ?, should it be after the EAD/ES add or only after the MAC add is
> received again from PE1 ?
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> Is it mandatory for PE1 to send the MAC add again in this scenario ?
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> Thanks,
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> Chalapathi.
>