09-04-2008 12:40 PM - edited 03-04-2019 03:13 AM
Ok, so I'm migrating from an older Cisco 2501 router to a Cisco 1841 router and was hopeing you kind folks could glance at my config to make sure it's ok.
Old Config off 2501:
Building configuration...
Current configuration:
!
version 11.1
service slave-log
service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname SiteA2501
!
clock timezone EST -5
enable password 7
!
ip subnet-zero
ip domain-list **.ads
ip domain-list **.com
ip dhcp-server 10.1.1.50
ip dhcp-server 10.1.1.17
!
stun peer-name 10.4.0.1
stun protocol-group 9 basic
location Chapin, SC 29036
!
interface Loopback0
ip address 10.4.0.1 255.255.0.0
!
interface Ethernet0
ip address 10.1.1.110 255.255.0.0
ip helper-address 10.1.1.50
ip helper-address 10.1.1.17
no ip mroute-cache
no ip route-cache
!
interface Serial0
description SiteB point-to-point T1 CH 1-23
ip address 10.2.1.110 255.255.0.0
ip helper-address 10.1.1.50
ip helper-address 10.1.1.17
no ip mroute-cache
no ip route-cache
!
router rip
network 10.0.0.0
!
ip host SiteB 10.3.1.110
ip domain-name ellettnt.ads
ip name-server 10.1.1.26
ip name-server 10.1.1.27
ip classless
ip route 0.0.0.0 0.0.0.0 10.1.1.120
ip route 10.3.0.0 255.255.0.0 10.2.1.111
ip route 10.9.0.0 255.255.0.0 10.1.1.120
ip route 10.20.0.0 255.255.0.0 10.1.1.120
ip route 10.30.0.0 255.255.0.0 10.1.1.120
ip http server
logging console critical
logging trap notifications
logging 10.1.1.40
!
snmp-server community public RO
snmp-server chassis-id 02112359-SiteA 2501
banner motd ^C
This is an official computer system of **. It is for authorized users only. Unauthorized users are prohibited. Users (authorized or unauthorized) have no explicit or implicit expectation of privacy. ^C
!
line con 0
password 7
login
line aux 0
transport input all
line vty 0 4
password 7
login
line vty 5 15
password 7
login
!
end
SiteA2501#sh int serial 0
Serial0 is up, line protocol is up
Hardware is HD64570
Description: SiteB point-to-point T1 CH 1-23
Internet address is 10.2.1.110/16
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 150/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 2/75/71211 (size/max/drops); Total output drops: 80933
Queueing strategy: weighted fair
Output queue: 0/64/80933 (size/threshold/drops)
Conversations 0/13 (active/max active)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 43000 bits/sec, 102 packets/sec
5 minute output rate 913000 bits/sec, 139 packets/sec
293312335 packets input, 1327698136 bytes, 41 no buffer
Received 3110006 broadcasts, 0 runts, 0 giants
10137 input errors, 817 CRC, 64 frame, 7 overrun, 574 ignored, 193 abort
339084900 packets output, 141211984 bytes, 0 underruns
0 output errors, 0 collisions, 99 interface resets
0 output buffer failures, 0 output buffers swapped out
30 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
SiteA2501#
I attached the new config due to character limitations.
For the most part I've carried everything over with the exception of a few things. Thanks for your help!
09-04-2008 02:03 PM
I recommend enabling mroute-cache and route-cache under the interfaces.
Process switching is very CPU intensive. Fast switching will dramatically improve router speed.
HTH,
__
Edison.
09-05-2008 04:49 AM
I've been thinking about enabling it on the ethernet interface that connects it to our LAN however I'm a little nervous about enabling it on the T1 link (serial 0/0/0). It's been difficult finding information about that command / service but most of the config's I've found for it point to point T1's that have it turned off (on the other end is an Avaya device). I may just have to play with it and see what happens. Thanks for your reply.
09-05-2008 05:09 AM
but most of the config's I've found for it point to point T1's that have it turned off
It was a default behavior on previous IOS versions. Newer IOS versions and Best Practice recommendations have these setting turned on.
You want to maximize the speed on these routers and having process-switching enabled isn't going to help.
__
Edison.
09-05-2008 05:25 AM
Why isn't CEF a better candidate?
09-05-2008 05:40 AM
I noticed on the 1841 when I ran the "no ip route-cache and no ip mroute-cache" commands it also disabled CEF, I guess that's a default characteristic? I still don't know that I fully understand what the difference between the 3 routing methods are (CEF, fast switching, process switching). Most of the info I've found assumes you already know it. I need a "Dummies" guide to router switching :)
09-05-2008 06:14 AM
Please take a look at this URL:
http://www.cisco.com/en/US/tech/tk827/tk831/technologies_white_paper09186a00800a62d9.shtml
HTH,
__
Edison.
Please rate helpful posts
09-05-2008 06:15 AM
CEF is the most optimal option but you need to start by enabling fast-switching first.
__
Edison.
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