From: Thameem Maranveetil Parambath (tparamba@thecontactcentre.ae)
Date: Thu Nov 06 2008 - 12:13:59 ARST
It seems to be a known problem with FR and virtual interface.. I got a
nice expalanation from the above blog..
Now I will try to rearrange the interface-dlci statements... Only thing I
am worried is if this comes on Lab, bcos there is no fix for this issue..
If you reload your router ..Gone..
Anywayz thanks for your support.
Warm Regards
Thameem M Parambath
----- Forwarded by Thameem Maranveetil Parambath/IT/CC/CONTACTCENTRE/AE on
06/11/2008 06:12 PM -----
Thameem Maranveetil Parambath/IT/CC/CONTACTCENTRE/AE
06/11/2008 05:28 PM
To
"Pavel Bykov" <slidersv@gmail.com>
cc
ccielab@groupstudy.com
Subject
Re: Can some one help - Loop during OSPF lab
Thanks Pavel.
I am really confused now. It says that 128.1.136.0 route is being
recieved from 150.1.1.1(R1) , but through Virtual-Access2 (which is bound
to DLCI 502)
How can I further troubleshoot this issue?
R5#sh ip ro 128.1.136.0
Routing entry for 128.1.136.0/24
Known via "ospf 1", distance 110, metric 2, type inter area
Last update from 128.1.125.1 on Virtual-Access2, 00:00:02 ago
Routing Descriptor Blocks:
* 128.1.125.1, from 150.1.1.1, 00:00:02 ago, via Virtual-Access2
Route metric is 2, traffic share count is 1
*******************************************************************************
R5#sh int virtual-access 2
Virtual-Access2 is up, line protocol is up
Hardware is Virtual Access interface
Internet address is 128.1.125.5/24
MTU 1500 bytes, BW 100000 Kbit, DLY 100000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Open
Open: IPCP
PPPoFR vaccess, cloned from Virtual-Template1
Vaccess status 0x44
Bound to Serial1/0.1 DLCI 502, Cloned from Virtual-Template1, loopback
not set
***********************************************************************************
R5#sh run int s1/0.1
Building configuration...
interface Serial1/0.1 multipoint
frame-relay interface-dlci 501 ppp Virtual-Template1
frame-relay interface-dlci 502 ppp Virtual-Template1
end
*************************************************************************************
R5#sh ip int b | inc Virt
Virtual-Access1 128.1.125.5 YES TFTP up up
Virtual-Template1 128.1.125.5 YES manual down down
Virtual-Access2 128.1.125.5 YES TFTP up up
Virtual-Access3 unassigned YES unset down down
************************************************************************************
Warm Regards
Thameem M Parambath
"Pavel Bykov" <slidersv@gmail.com>
06/11/2008 04:54 PM
To
"Thameem Maranveetil Parambath" <tparamba@thecontactcentre.ae>
cc
ccielab@groupstudy.com
Subject
Re: Can some one help - Loop during OSPF lab
Uh... R5 points back to R2:
O IA 128.1.136.0/24 [110/2] via 128.1.125.1, 00:05:54, Virtual-Access2
So even though the IP address is of R1, the interface is of PPP to R2.
Check LSAs and CEF.
On Thu, Nov 6, 2008 at 11:22 AM, Thameem Maranveetil Parambath <
tparamba@thecontactcentre.ae> wrote:
R5
- -
- -
- -
R2 R1
-
-
---------------------------
- -
- -
R6 R3
Subnet 128.1.125.0/24
R5, R2 and R1 in Frame-Relay Multipoint , R5 is the HUB, all of these are
in PPPoFR with virtual template and DLCI assigned to interface.
OSPF area 125 is running in the FR segment, also FR network type
point-to-multi is employed.
Subnet 128.1.136.0/24
R1,R6,R3 are in Broadcast multiaccess. They are in OSPF area 0.
I can ping from R2 to R1 (128.1.125.2 --> 128.1.125.1), But I cannot
ping from (128.1.125.2 to 128.1.136.1(routerR1's ethernet interface).
When I did a trace route(128.1.125.2 to 128.1.136.1(routerR1's ethernet
interface), I got this loop.
****************************************************************
R2#traceroute 128.1.136.1
Type escape sequence to abort.
Tracing the route to 128.1.136.1
1 128.1.125.5 92 msec 56 msec 40 msec
2 * * *
3 128.1.125.5 104 msec 104 msec 32 msec
4 * * *
5 128.1.125.5 152 msec 100 msec 52 msec
6 * * *
7 128.1.125.5 120 msec 132 msec 104 msec
8 * *
**********************************************************************
Can someone help to avoid this loop.
Routing table of R1,
*******************************************
128.1.0.0/16 is variably subnetted, 6 subnets, 2 masks
C 128.1.136.0/24 is directly connected, FastEthernet0/0.1
C 128.1.14.0/24 is directly connected, FastEthernet0/0.2
O 128.1.63.0/24 [110/11112] via 128.1.136.6, 00:04:33,
FastEthernet0/0.1
[110/11112] via 128.1.136.3, 00:04:33,
FastEthernet0/0.1
C 128.1.125.5/32 is directly connected, Virtual-Access1
C 128.1.125.0/24 is directly connected, Virtual-Access1
O 128.1.125.2/32 [110/2] via 128.1.125.5, 00:45:22, Virtual-Access1
150.1.0.0/24 is subnetted, 1 subnets
C 150.1.1.0 is directly connected, Loopback1
****************************************************
Routing table of R2,
**************************************************
128.1.0.0/16 is variably subnetted, 6 subnets, 2 masks
O IA 128.1.136.0/24 [110/3] via 128.1.125.5, 00:05:14, Virtual-Access2
C 128.1.27.0/24 is directly connected, FastEthernet0/0
O IA 128.1.63.0/24 [110/11114] via 128.1.125.5, 00:08:34,
Virtual-Access2
C 128.1.125.5/32 is directly connected, Virtual-Access2
C 128.1.125.0/24 is directly connected, Virtual-Access2
O 128.1.125.1/32 [110/2] via 128.1.125.5, 00:46:08, Virtual-Access2
150.1.0.0/24 is subnetted, 1 subnets
C 150.1.2.0 is directly connected, Loopback0
**********************************************************
Routing table of R5
*********************************************************
128.1.0.0/16 is variably subnetted, 8 subnets, 2 masks
O IA 128.1.136.0/24 [110/2] via 128.1.125.1, 00:05:54, Virtual-Access2
C 128.1.5.0/24 is directly connected, Ethernet0/1
C 128.1.45.0/24 is directly connected, Dialer0
C 128.1.59.0/24 is directly connected, Ethernet0/0
O IA 128.1.63.0/24 [110/11113] via 128.1.125.1, 00:09:14,
Virtual-Access2
C 128.1.125.0/24 is directly connected, Virtual-Access2
is directly connected, Virtual-Access1
C 128.1.125.1/32 is directly connected, Virtual-Access1
C 128.1.125.2/32 is directly connected, Virtual-Access2
150.1.0.0/24 is subnetted, 1 subnets
C 150.1.5.0 is directly connected, Loopback0
************************************************************
Please help me from this loop.
Thameem M Parambath
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