[c-nsp] Whats happens when TCAM is full on 7600/RSP720RSP-3CXL?

[Gert Doering]

Hi,

On Fri, Sep 18, 2020 at 10:54:53AM +0200, chiel wrote:
> 3. New route entries will be software routed, but entries that are 
> already in TCAM will be hardware routed. You won't notice much impact in 
> the beginning.

"Route entries that have churn will end up in software" *and* "the
software path is heavily rate-limited".

So "for some targets you'll see massive packet loss".

Only a reload will get this fixed -> avoid this situation.

> What is true?
> 
> The only reason that our 7606 needs to be replaces it because of the 
> TCAM. It doesn't do much traffic, like 3Gbps upstream. Only BGP/OSPF. 
> And not many ports, 8 x 10Gb fiber + 30 x 1Gb copper (local servers).
> 
> We will probably go for the ASR9006. But I would like to use it like I'm 
> using the 7600 now, as a router/switch. I have been reading that you 
> need to make some uncommon config to create Ethernet VLAN/Trunk 
> interfaces and ports, as this is not commonly not done with this router. 
> But is this good practice? Will it be fine once I fingered it out?

If spanning tree is involved, the ASR9k gets clunky.

Besides that, it does routing/switching on VLANs and trunks nicely
(though the config is quite different to "more switchy" platforms
like the 6500/7600).

> Last question. Can I take a full BGP feed on both v4 and v6 with a 
> A9K-RSP440-TR? Or do I need the -SE?

The RSP440 will cope nicely.  It is end-of-life, though.

gert
-- 
"If was one thing all people took for granted, was conviction that if you 
 feed honest figures into a computer, honest figures come out. Never doubted 
 it myself till I met a computer with a sense of humor."
                             Robert A. Heinlein, The Moon is a Harsh Mistress

Gert Doering - Munich, Germany                             gert at greenie.muc.de
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