Fahad,
BFD probes directly connected IP neighbors (since it is run over IP) , in case
of L2circuit it will be CE-CE.
803.2ah is scheduled in future JUNOS releases, AFAIK.
I'm still not clear why you need to probe CE-PE link. If BFD/IP SLA probes
would indicate CE-CE connectivity problem on IP level then surely the CE should
be able to take a remedy action: switch to backup link/protect-interface which
should be by that time enabled by PE.
Rgds
Alex
----- Original Message -----
From: FAHAD ALI KHAN
To: Alex ; juniper-nsp
Sent: Thursday, January 25, 2007 4:24 AM
Subject: Re: [j-nsp] L2circuit martini issue....!
Alex.....Clear me in one thing....does BFD can probe L2circuit...and this
probing is done from CE to PE?
This is confusing. and if it can probe L2circuit.....L2circuit will remain
UP...it didn't depend on the failure of Lastmile of client (when CE connects to
FR Switch/L2 Switch and NNI/Trunk to PE) as i discuss in my previous mail. FR
DLCI goes down but its FR-CCC link never. and this cause L2circuit to remain
UP.
Also Does Juniper M10i/M7i/J-Series Routers supports Ethernet OAM
(802.3ah)....if yes than sample configuration will be reuired....!
Regards
Fahad
On 1/24/07, Alex <[EMAIL PROTECTED]> wrote:
Fahad,
In absense of Ethernet OAM you can still use BFD/IP SLA to constantly probe
the L2circuit and tear down IGP adjacencies/sink static routes/disable PBR.
BTW, you can also use RPM+event/commit scripts on Junipe boxes to
accomplish the same thing as Cisco IP SLA does.
Cheers
Alex
----- Original Message -----
From: FAHAD ALI KHAN
To: Alex ; juniper-nsp
Sent: Wednesday, January 24, 2007 11:42 AM
Subject: Re: [j-nsp] L2circuit martini issue....!
Your understanding is correct but let me clear some background issues
that i discuss few days ago......!
Most of our client termination are in a manner that Ethernet clients are
terminated over switch and than truncked to Juniper..and FR clients are
terminated over NNI between FR switch and Juniper.,....and than they
transported over Martini...but the issue is that..when the lastmile of client
goes down....Juniper didnt down its CCC state....means....DLCI shows down but
not FR-CCC similarly VLAN-CCC is not down.
here are the interface stats when Client lastmile goes down.....
show interfaces ds-1/1/2:1.0
Logical interface ds-1/1/2:1.0 (Index 121) (SNMP ifIndex 156)
Description: *** Client X SITE B ***
Flags: Point-To-Point SNMP-Traps Encapsulation: FR-CCC
Input packets : 47743200
Output packets: 43623195
Protocol ccc, MTU: 1504
Flags: None
DLCI 152
Flags: Down, DCE-Configured
Total down time: 53:49:06 sec, Last down: 01:34:06 ago
Input packets : 47743200
Output packets: 43623195
And DLCI flag DOWN will not cause FR-CCC to down.....and this will cause
L2circuit to remain UP. and if the primary link FR-CCC is not down client
cann't use the protected interface.
show l2circuit connections
Neighbor: A.B.C.D
Interface Type St Time last up # Up trans
ds-1/1/2:1.0{vc 152) rmt Up Dec 26 08:32:09 2006 1
Local interface: ds-1/1/2:1.0, Status: Up , Encapsulation: FRAME RELAY
Remote PE: W.X.Y.Z, Negotiated control-word: Yes (Null)
Incoming label: 102320, Outgoing label: 155888
Similar is the case with VLAN transport over Martini....!
And this is causing us alot of problem....!
On 1/24/07, Alex <[EMAIL PROTECTED] > wrote:
Fahad,
My understnding of "protect-interface" feature is that as long as
Primary interface is UP then protect-interface is DOWN, the protect-interface
is activated when Primary fails:
"primary interface has priority over the protect interface and carries
network traffic as long as it is functional. If the primary interface fails,
the protect interface is activated"
http://www.juniper.net/techpubs/software/junos/junos81/swconfig81-vpns/html/l2circuits-examples.html#1018999
Sort-of "backup-interface" in Cisco speak.
So when PE-A client has 2 last-mile interfaces, one of then Primary and
second one as protect-interface, then in normal conditions the Primary is UP
and protect os DOWN. When primary fails and goes DOWN, protect is activated and
goes UP. Client should be able to recognise the failure if it is DIRECTLY
connected to PE-A and fail over the traffic to protect-interface. If there is a
L2 switch in between then the whole process should be transparent to the client
and it should not even notice the failover.
Is my understanding of your scenario correct?
Cheers
Alex
----- Original Message -----
From: FAHAD ALI KHAN
To: Alex
Cc: juniper-nsp
Sent: Wednesday, January 24, 2007 10:16 AM
Subject: Re: [j-nsp] L2circuit martini issue....!
Well Alex it will help in CE-CE link tracking.....and PE will never
know any thing.....!
But consider a scenario, On PE-A clinet hav two last miles, one
primary and other backup. We configure L2Circuit and set Pri lastmile as
primary link and secondary lastmile as protected one (under the protocol
l2circuit hierarchy). So If PE didnt know abt it and put down Primary link's
CCC/TCC, client cannot use secondary Lastmile.
In this case use of every CE-CE link tracking methodologies will
fail.....?
Regards
Fahad Ali Khan
On 1/24/07, Alex <[EMAIL PROTECTED] > wrote:
Fahad,
If you are looking for End-to-End failure detection for L2VPN where
PE-CE links are Ethernet then You can do it either with BFD or IP SLA Cisco
feature. Please be aware than BFD/IP SLA do not actually bring down the
interface/subinterface, they either tear down IGP adjacencies (BFD), remove
static routes (BFD/IP SLA) or disable PBR (IP SLA).
HTH
Cheers
Alex
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