From: Mike Williams (ccie2be@swbell.net)
Date: Sat Apr 19 2003 - 02:59:08 GMT-3
Hey all, sorry for the waste of bandwidth. But I figured this
out.....(and besides it's text, which takes virtually no bandwidth =).
And I have to say that the answer to this makes sense, but isn't very
well presented, even by Caslow.
In my previous post I showed the frame mappings on R6 (that showed a
dynamic mapping to 150.50.100.2) and then I rebooted and it CAME BACK
even tho I had a frame map on that same DLCI. What I didn't show you
was the config on the other end (R2) which WAS:
R2#show run int s1.256
interface Serial1.256 multipoint
ip address 150.50.100.2 255.255.255.224
frame-relay interface-dlci 105
frame-relay interface-dlci 106
I eventually realized that when I setup R2 to ping it's own interface I
had to map it's local IP (150.50.100.2) to one of the DLCI's on this
subinterface, making the config look like this:
R2#show run int s1.256
interface Serial1.256 multipoint
ip address 150.50.100.2 255.255.255.224
frame-relay map ip 150.50.100.2 106
frame-relay interface-dlci 105
frame-relay interface-dlci 106
Then it struck me, that by doing this, it would disable inverse arp for
DLCI 106. So I went to R6 and repeated my previous experiment. This
time after I rebooted, I no longer had the dynamic mapping for
150.50.100.2.
So what the textbooks SHOULD say is: "When you do a frame map statement
on one router, it disabled the inverse arp so that any REMOTE router
that CONNECTS via this DLCI cannot do dynamic mappings. However, using
a frame map on a given router DOES NOT prevent that same router from
dynamically mapping IPs learned via that same DLCI that you are using
the frame map statement on." Again to quote Caslow's book, ". . .
inverse arp will be disabled for that specific protocol only for the
DLCI referenced in the frame-relay map statement." However this doesn't
prevent said router from learning mappings on this DLCI. Geez... what a
pain. Now if I can only figure out this Be, Bc, Tc crap, I can move on
to more fun/frustrating lab scenarios. LOL.
Output from the "new" experiment is below (if you wish to compare to
that in my previous post):
<---------- begin output ------------->
R6#sh frame map
Serial1 (up): ip 150.50.100.2 dlci 601(0x259,0x9490), dynamic,
broadcast,, status defined, active
Serial1 (up): ip 150.50.100.5 dlci 601(0x259,0x9490), static,
broadcast,
CISCO, status defined, active
Serial1 (up): ip 150.50.100.6 dlci 601(0x259,0x9490), static,
CISCO, status defined, active
R6#ping 150.50.100.6
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 150.50.100.6, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/35/40 ms
R6#wr mem
Building configuration...
[OK]
R6#reload
Proceed with reload? [confirm]y
00:49:53: %SYS-5-RELOAD: Reload requested
System Bootstrap, Version 5.3(10) [tamb 10], RELEASE SOFTWARE (fc1)
Copyright (c) 1994 by cisco Systems, Inc.
ccie4u_term>x6
Translating "x6"
Translating "x6"
% Unknown command or computer name, or unable to find computer address
ccie4u_term>6
[Resuming connection 6 to ipr6 ... ]
C4500 processor with 65536 Kbytes of main memory
program load complete, entry point: 0x80008000, size: 0x2b9e04
Self decompressing the image :
########################################################################
########################################################################
########################################################################
############################## [OK]
program load complete, entry point: 0x80008000, size: 0x9a1a34
Self decompressing the image :
########################################################################
########################################################################
########################################################################
########################################################################
########################################################################
########################################################################
########################################################################
########################################################################
########################################################################
########################################################################
########################################################################
########################################################################
####################### [OK]
Restricted Rights Legend
Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.
cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706
Cisco Internetwork Operating System Software
IOS (tm) 4500 Software (C4500-A3JK9S-M), Version 12.2(2)T4, RELEASE
SOFTWARE (fc3)
TAC Support: http://www.cisco.com/tac
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Sat 09-Feb-02 21:48 by yiyan
Image text-base: 0x600089C8, data-base: 0x61322000
Compliance with U.S. Export Laws and Regulations - Encryption
This product performs encryption and is regulated for export
by the U.S. Government.
This product is not authorized for use by persons located
outside the United States and Canada that do not have prior
approval from Cisco Systems, Inc. or the U.S. Government.
This product may not be exported outside the U.S. and Canada
either by physical or electronic means without PRIOR approval
of Cisco Systems, Inc. or the U.S. Government.
Persons outside the U.S. and Canada may not re-export, resell,
or transfer this product by either physical or electronic means
without prior approval of Cisco Systems, Inc. or the U.S.
Government.
cisco 4700 (R4K) processor (revision C) with 65536K/4096K bytes of
memory.
Processor board ID 03446045
R4700 CPU at 133Mhz, Implementation 33, Rev 1.0, 512KB L2 Cache
G.703/E1 software, Version 1.0.
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
TN3270 Emulation software.
2 Ethernet/IEEE 802.3 interface(s)
2 Serial network interface(s)
1 ATM network interface(s)
128K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read/Write)
4096K bytes of processor board Boot flash (Read/Write)
Press RETURN to get started!
00:00:11: %LINK-3-UPDOWN: Interface Ethernet0, changed state to up
00:00:11: %LINK-3-UPDOWN: Interface Ethernet1, changed state to up
00:00:11: %LINK-3-UPDOWN: Interface Serial0, changed state to down
00:00:11: %LINK-3-UPDOWN: Interface Serial1, changed state to up
00:00:12: %SYS-5-CONFIG_I: Configured from memory by console
00:00:13: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0,
changed state to down
00:00:13: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet1,
changed state to down
00:00:13: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0,
changed state to down
00:00:13: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1,
changed state to up
00:00:13: %SYS-5-RESTART: System restarted --
Cisco Internetwork Operating System Software
IOS (tm) 4500 Software (C4500-A3JK9S-M), Version 12.2(2)T4, RELEASE
SOFTWARE (fc3)
TAC Support: http://www.cisco.com/tac
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Sat 09-Feb-02 21:48 by yiyan
00:00:13: %SYS-6-BOOTTIME: Time taken to reboot after reload = 69
seconds
00:00:14: %LINK-5-CHANGED: Interface Ethernet0, changed state to
administratively down
00:00:14: %LINK-5-CHANGED: Interface Ethernet1, changed state to
administratively down
00:00:14: %LINK-5-CHANGED: Interface ATM0, changed state to
administratively down
00:00:15: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0, changed
state to down
R6#
R6#
R6#sh run int s1
Building configuration...
Current configuration : 239 bytes
!
interface Serial1
ip address 150.50.100.6 255.255.255.224
encapsulation frame-relay
fair-queue
clockrate 125000
frame-relay map ip 150.50.100.5 601 broadcast
frame-relay map ip 150.50.100.6 601
frame-relay interface-dlci 601
end
R6#sh frame map
Serial1 (up): ip 150.50.100.5 dlci 601(0x259,0x9490), static,
broadcast,
CISCO, status defined, active
Serial1 (up): ip 150.50.100.6 dlci 601(0x259,0x9490), static,
CISCO, status defined, active
R6#
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