>sh ver
>sh run
>и как это проявляется? пакеты дропаются?

UBR7223#show ver
Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (UBR7200-IK1S-M), Version 12.1(5)T8,  RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/cgi-bin/ibld/view.pl?i=support
Copyright (c) 1986-2001 by cisco Systems, Inc.
Compiled Mon 07-May-01 12:26 by ccai
Image text-base: 0x60008960, data-base: 0x61678000

ROM: System Bootstrap, Version 12.1(20000710:044039) [nlaw-121E_npeb 117], DEVELOPMENT SOFTWARE
BOOTFLASH: 7200 Software (UBR7200-BOOT-M), Version 12.0(15)SC, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

Router_UBR7223 uptime is 2 weeks, 3 days, 9 hours, 0 minutes
System returned to ROM by bus error at PC 0x606D6E70, address 0x606D6E70 at 07:33:14 ALA Tue Mar 8 2005
System restarted at 07:34:39 ALA Tue Mar 8 2005
System image file is "sup-slot0:/ubr7200-ik1s-mz.121-5.T8"

cisco uBR7223 (NPE225) processor (revision A) with 110592K/20480K bytes of memory.
Processor board ID SAB050400VD
R527x CPU at 262Mhz, Implementation 40, Rev 10.0, 2048KB L2 Cache
3 slot midplane, Version 1.0

Last reset from power-on
G.703/E1 software, Version 1.0.
G.703/JT2 software, Version 1.0.
Bridging software.
X.25 software, Version 3.0.0.
1 FastEthernet/IEEE 802.3 interface(s)
4 Serial network interface(s)
2 Cable Modem network interface(s)
125K bytes of non-volatile configuration memory.

UBR7223#show run
Building configuration...

Current configuration : 20771 bytes
!
! Last configuration change at 15:50:01 ALA Fri Mar 25 2005
! NVRAM config last updated at 11:54:00 ALA Fri Mar 25 2005
!
version 12.1
no parser cache
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
service password-encryption
service udp-small-servers max-servers no-limit
service tcp-small-servers max-servers no-limit
!
hostname UBR7223
!
boot system flash ubr7200-ik1s-mz.121-5.T8
boot system disk0:/ubr7200-ik1s-mz.121-5.T8
logging rate-limit console 10 except errors
enable secret level 3 5 XXXXXXXXXXXXXXXXX
enable secret 5 XXXXXXXXXXXXXXX
!
no cable qos permission create
no cable qos permission update
cable qos permission modems
cable time-server
clock timezone ALA 6
clock summer-time ALASUM recurring last Sun Mar 2:00 last Sun Oct 3:00
clock calendar-valid
ip subnet-zero
no ip finger
ip dhcp relay information option
!
!
!
interface FastEthernet0/0
ip address 192.168.250.1 255.255.255.0 secondary
ip address X.X.X.X 255.255.255.240
no ip redirects
no ip unreachables
ip accounting output-packets
full-duplex
!
interface Serial1/0
no ip address
shutdown
no fair-queue
!
interface Serial1/1
no ip address
shutdown
no fair-queue
!
interface Serial1/2
no ip address
shutdown
!
interface Serial1/3
no ip address
shutdown
!
interface Cable2/0
ip address Z.Z.Z.Z 255.255.0.0 secondary
ip address Z.Z.Z.Z 255.255.0.0
ip access-group 101 in
no ip redirects
no ip unreachables
ip accounting output-packets
no keepalive
cable downstream annex B
cable downstream modulation 256qam
cable downstream interleave-depth 32
cable downstream frequency 711000000
cable upstream 0 frequency 24000000
cable upstream 0 power-level 0
cable upstream 0 channel-width 3200000
no cable upstream 0 shutdown
cable upstream 1 frequency 24000000
cable upstream 1 power-level 0
cable upstream 1 channel-width 3200000
no cable upstream 1 shutdown
cable upstream 2 frequency 24000000
cable upstream 2 power-level 0
cable upstream 2 channel-width 3200000
no cable upstream 2 shutdown
cable upstream 3 frequency 24000000
cable upstream 3 power-level 0
cable upstream 3 channel-width 3200000
no cable upstream 3 shutdown
cable upstream 4 frequency 24000000
cable upstream 4 power-level 0
cable upstream 4 channel-width 3200000
no cable upstream 4 shutdown
cable upstream 5 frequency 24000000
cable upstream 5 power-level 0
cable upstream 5 channel-width 3200000
no cable upstream 5 shutdown
no cable proxy-arp
cable dhcp-giaddr policy
cable helper-address X.X.X.X
!
interface Cable3/0
ip address Z.Z.Z.Z 255.255.255.0 secondary
ip address Z.Z.Z.Z 255.255.255.0
ip access-group 102 in
no ip redirects
no ip unreachables
ip directed-broadcast
ip accounting output-packets
no keepalive
cable downstream annex B
cable downstream modulation 256qam
cable downstream interleave-depth 32
cable downstream frequency 719000000
cable upstream 0 frequency 27504000
cable upstream 0 power-level 0
cable upstream 0 channel-width 3200000
no cable upstream 0 shutdown
cable ip-broadcast-echo
cable dhcp-giaddr policy
cable helper-address X.X.X.X
!
ip classless
ip route 0.0.0.0 0.0.0.0 X.X.X.X
ip route 172.17.0.0 255.255.0.0 X.X.X.X
ip route 172.18.0.0 255.255.0.0 X.X.X.X
ip route Y.Y.Y.Y 255.255.255.240 10.0.0.10
ip flow-export version 6
no ip http server
!

[далее ACL, не суть важно, на Ethernet'е их нет...]

end

при попытке дебага CEF drops, CEF interfaces, упоминания про адреса из этих двух сетей нет... Проявляется в резком замедлении обмена между двумя сетями.