Re: L3 DSR
Joo Yong-Seok <[email protected]>
| Newsgroups | gmane.comp.programming.load-balancing.general |
|---|---|
| Message-ID | <[email protected]> |
I suppsoe that L2 or L3 config doesn't matter. the important thing in DSR is
"returning packet" should
not be forwarded to L4 and L4 should not do any processing for that.
Clients
|
| 192.168.10.0/24, VIP : 192.168.10.100
|
L3-SW ==== L4 SW
|
|
| 10.10.10.0/24
Servers
In this topoloty, L4 can have two interfaces for 192.168.10.0/24 and
10.10.10.0/24. In Servers point of
view, GW should be L3-SW. Client requests will be forwarded to L3 but L3
knows the VIP location (L4)
and it will forward the request via L2-fwd.
L4 will do a client processing and send the packet to Servers. In this
moment, DSR should be enabled
and request packet's DIP is not modified. and Server will received the
packet and then forward it to L3-SW
since L3-SW is a gateway for servers.
I suppose that this is L3 DSR and return packet will not traverse to L4.
Also, L4-SW is in the same network with servers, health check by using
real-mac (VIPhealth) is also
working and No mac flapping. (Since L4 is doing L3 fwd + L4 processing and
packet's SIP should be
modified. L3-SW will not have any duplicate mac-address entry in the fdb. -
Even there are same mac
in fdb, if VLAN is different, there should be no issues to do a L2-fwd).
I have no idea why L2 broadcast issue is there on DSR. (do you mean
"mac-flapping"? - this can cause
flooding in the network).
Best regards,
- yongseok
2009/3/30 SungLyeol Choi <[email protected]>
> Hi guys.
> Have you heard about L3 DSR?
> which vendors support this?
> I heard L3 DSR could protect L2 broadcast. but I think LB should consider a
> lot of things to support that.
>
> Thanks.
>
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