Routing question

Answered Question
Feb 16th, 2010

Simple question:

Will a 6509 still route traffic between connected vlans ( with interfaces and addresses assigned ) without the "ip routing" command in it's configuration?

I have this problem too.
0 votes
Correct Answer by dario.didio about 6 years 9 months ago

IP Routing on a C6500 it is enabled by default, and it is also enabled on your C6500.

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dario.didio Tue, 02/16/2010 - 05:28

Hi,

no this will not work.

When you disable routing you turn your C6500 into a bridge. In fact, you won't be able to have more than 1 L3 interface active.

HTH,

Dario

fdouble08 Tue, 02/16/2010 - 05:51

Reason I asked is that I have a 6509 with 7 vlans.  Each VLAN has a VLAN interface configured with an IP address assigned.  Traffic flows between VLANs with no problem.  The 6509 configuration does not include the "ip routing" command.  The following is from my 6509.  I trimmed unneccessary details to keep it small. 

no aaa new-model

ip subnet-zero

!

ip domain-name **********

ip name-server **.**.**.**

mls flow ip destination

mls flow ipx destination

no mls acl tcam share-global

!

redundancy

mode sso

main-cpu

auto-sync running-config

auto-sync standard

spanning-tree mode pvst

diagnostic cns publish cisco.cns.device.diag_results

diagnostic cns subscribe cisco.cns.device.diag_commands

!

vlan internal allocation policy ascending

!

!

interface Vlan1

no ip address

shutdown

!

interface Vlan23

ip address 10.6.23.1 255.255.255.0

!

interface Vlan24

description Net_10.6.24.0/24-10.6.25.0/24

ip address 10.6.24.1 255.255.255.0

ip helper-address 10.6.24.93

no ip redirects

!

interface Vlan26

description Net_10.6.26.0/24

ip address 10.6.26.1 255.255.255.0

ip helper-address 10.6.24.93

no ip redirects

!

interface Vlan27

description Net_10.6.27.0/24

ip address 10.6.27.1 255.255.255.0

ip helper-address 10.6.24.93

no ip redirects

!

interface Vlan28

description Net_10.6.28.0/24

ip address 10.6.28.1 255.255.255.0

ip helper-address 10.6.24.93

no ip redirects

!

interface Vlan29

ip address 10.6.29.1 255.255.255.0

ip helper-address 10.6.24.93

no ip redirects

!

interface Vlan30

ip address 192.168.1.6 255.255.255.0

ip helper-address 10.6.24.93

no ip redirects

!

interface Vlan40

ip address 10.10.4.1 255.255.252.0

ip helper-address 10.6.24.93

no ip redirects

!

ip default-gateway 10.6.23.10

ip classless

ip route 0.0.0.0 0.0.0.0 10.6.23.10

ip route 10.0.46.0 255.255.255.0 10.6.23.5

!

no ip http server

!

tftp-server exit

!

dial-peer cor custom

!

end

fdouble08 Tue, 02/16/2010 - 06:09

I see connected subnets and static routes for other subnets.

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.6.23.10 to network 0.0.0.0

     204.187.87.0/32 is subnetted, 1 subnets
S       204.187.87.33 [1/0] via 10.6.24.201
S       81.255.165.0/24 [1/0] via 10.6.23.10
S       81.255.170.41/32 [1/0] via 10.6.23.10
S       81.255.165.149/32 [1/0] via 10.6.23.10
     10.0.0.0/8 is variably subnetted, 30 subnets, 5 masks
S       10.26.16.0/20 [1/0] via 10.6.23.10
C       10.10.4.0/22 is directly connected, Vlan40
C       10.6.28.0/24 is directly connected, Vlan28
C       10.6.29.0/24 is directly connected, Vlan29
C       10.6.24.0/24 is directly connected, Vlan24
C       10.6.25.0/24 is directly connected, Vlan24
C       10.6.26.0/24 is directly connected, Vlan26
S       10.13.16.0/24 [1/0] via 10.6.23.10
C       10.6.27.0/24 is directly connected, Vlan27
C       10.6.23.0/24 is directly connected, Vlan23
S       10.1.16.0/20 [1/0] via 10.6.23.10
S       10.11.28.0/22 [1/0] via 10.6.23.10
S       10.6.46.0/24 [1/0] via 10.6.23.5
S       10.0.46.0/24 [1/0] via 10.6.23.5
S       10.65.0.0/16 [1/0] via 10.6.23.10

dario.didio Tue, 02/16/2010 - 06:15

Hi,

Routing is enabled on your C6500. It is not in the config because it is enabled by default.

HTH,

Dario

fdouble08 Tue, 02/16/2010 - 07:08

I 'm not sure that routing is enabled by default.  The 6509 (w/msfc2) has MLS enabled.  With Multilayer switching enabled, it will "switch" layer 3 traffic.  Sort of like routing, only it appears to have some limitations.  But, I wouldn't expect it to allow me to create static routes without routing enabled.

Correct Answer
dario.didio Tue, 02/16/2010 - 07:25

IP Routing on a C6500 it is enabled by default, and it is also enabled on your C6500.

Kevin Dorrell Tue, 02/16/2010 - 06:21

Then it looks like ip routing is on by default.  I expect if you disabled it you would see no ip routing in the configuration, just like you do in a 4500.

Kevin Dorrell

Luxembourg

(Sorry Dario, crossed posting).

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