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Highlighted
Beginner

Layer 3 switch and 2921 router

My cisco 3750E POE switch is setup with the following:

3 separate Vlans 192.168.70.0, 192.168.80.0, 192.168.90.0

 

On my switch, I can ping all the gateways and also the pc's on each vlan but on the pc's I can only ping the gateways of each vlan and not the pc's? I have ip route on the switch enabled.

4 REPLIES 4
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Re: Layer 3 switch and 2921 router

Hi,

 

Checks:

1. Check the command "ip routing" is enabled in L3 switch.

2. Check the routing table for the routes. "sh ip route"

3. traceroute the packets and identify where it is dropping.

 

Check these 3 and let us know.

 

Regards,

Sathish

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Beginner

Re: Layer 3 switch and 2921 router

sh ip route info from switch:

Gateway of last resort is 192.168.1.1 to network 0.0.0.0

S* 0.0.0.0/0 [1/0] via 192.168.1.1
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168..0/24 is directly connected, GigabitEthernet1/0/48
L 192.168.1.2/32 is directly connected, GigabitEthernet1/0/48
192.168.75.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.75.0/24 is directly connected, Vlan10
L 192.168.75.1/32 is directly connected, Vlan10
192.168.80.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.80.0/24 is directly connected, Vlan15
L 192.168.80.1/32 is directly connected, Vlan15
192.168.85.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.85.0/24 is directly connected, Vlan30
L 192.168.85.1/32 is directly connected, Vlan30
192.168.90.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.90.0/24 is directly connected, FastEthernet0
L 192.168.90.1/32 is directly connected, FastEthernet0

 

Ping And Traceroute:

3750ELAB#traceroute 192.168.85.1
Type escape sequence to abort.
Tracing the route to 192.168.85.1
VRF info: (vrf in name/id, vrf out name/id)
1 192.168.85.1 0 msec * 0 msec
3750ELAB#

3750ELAB#traceroute 192.168.85.13
Type escape sequence to abort.
Tracing the route to 192.168.85.13
VRF info: (vrf in name/id, vrf out name/id)
1 * * *
2 * * *
3 * * *
4 * * *
5 * * *
6 * *


3750ELAB#ping 192.168.85.13
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.85.13, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/8 ms
3750ELAB#

3750ELAB#ping 192.168.85.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.85.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/8 ms
3750ELAB#

Highlighted
VIP Expert

Re: Layer 3 switch and 2921 router

Do your PCs have their VLAN's SVI (on the 3750) configured as their default gateway?
Highlighted
Beginner

Re: Layer 3 switch and 2921 router

My pc's recieve ip addresses from windows dhcp server. and yes for each vlan that was created on the switch, I moved 3 ports into each vlan so if 3 pc's are on vlan 10 they get dhcp ip address for vlan 10 and if they are on vlan 20 or 30 they get the dhcp ip address for those configure vlans.

 

I can ping all the default gateways from the pc's but if I want to ping a pc in vlan 30 to a pc in vlan 10 I cannot and vice versa

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