02-02-2007 04:56 AM - edited 03-05-2019 02:07 PM
Hello
I have problem to ping GW on my 4510, I have create one vlan for each VRF. when I put in a computer on a port 3/5 with an ip address in correct network, it just time out. I cant ping GW, but if I have many ports on same Vlan they have no problem ping each other. When I sniff i found that I recived L2 traffic like, STP, ARP, VTP but no L3 traffic.
All ports and Vlans are up.
It seems like the routingpart and the switchingpart only talks L2 and not L3.
All this worked yesterday, there was no problem. this morgning 4510 didnt answer at L3, but it still talks L2.
Some info:
Image 12.2(25)EWA7
Redundant SUP V
VRF-lite with BGP, 5 vrf
RSTP, configured 4510 as root, the ports are not in blocking state.
interface GigabitEthernet3/5
switchport access vlan 210
switchport mode access
interface Vlan210
ip vrf forwarding adm
ip address 172.16.1.254 255.255.0.0
On my computer i used 172.16.1.253 /16
This also worked yesterday.
Is there any good command that I can use to see if there is any problem between routingpart and switchingpart.
02-02-2007 08:10 AM
Hi,
Can you paste the config on the 4510?
Cheers
02-02-2007 08:23 AM
02-02-2007 08:39 AM
interface Vlan910
description ***till old admNet***
ip vrf forwarding adm
ip address 172.16.1.254 255.255.0.0
!
interface GigabitEthernet3/5
description ***VRF adm till old admNet***
switchport access vlan 910
switchport mode access
for ex. if I connect to port 3/5 with an adress of 172.16.1.253 I only se L2 traffic, like arp, vtp stp but no L3.
02-04-2007 06:50 PM
hi
what does the sh ip route vrf adm look like?
i would suggest removing VLAN 910 from vrf adm and try pinging the gateway.
Thanks
02-04-2007 08:58 PM
I haven't done vrfs before but I would have thought the interface network 172.16.0.0 would need to be under the vrf in :
router rip
version 2
no auto-summary
!
address-family ipv4 vrf adm
network 172.17.0.0
network 172.31.0.0
*** add network 172.16.0.0 here , perhaps? ***
no auto-summary
version 2
exit-address-family
Otherwise the route will not be in the routing table and therefore not advertised by BGP
hth
02-04-2007 11:57 PM
I dont think there is any problem with the routing part. I use "no synchronization" in bgp. Everything works for a for some hours and then there is no answer from GW. If I restart the switch i works again. On the network 172.16.0.0/16 there is about 1200 hosts.
02-04-2007 11:47 PM
Is the same result. I have removed all config, then I created a new vlan, new vlan interface with ip address (not in any vrf), and a port for that Vlan everything is up. if I configure two to ports to the same Vlan the can talk with each other but not with the gateway. there is still no connection between L2 and L3.
When I restart Cisco 4510, the problem disappear and the switch i function for a while, after some hours the problem occurs again.
02-05-2007 01:10 AM
It might be worth clearing the 4500's ARP table the next time it stops working to see if that makes any difference... also it would be interesting to see if you cleared the CAM table whether that would help & see if your host MAC is actually in the table.
I assume it is only this VLAN that is experiencing the problem?
02-05-2007 01:14 AM
The problem exist on every Vlan. I removed config and created a new vlan = same problem. i found my mac-adress in 4510.
02-05-2007 01:33 AM
What about the ARP table? If you clear it while the problem is happening, does it re-fill itself?
What happens if you run a sniff on the client PC and try to ping it from the 4500 (again, while the problem is ongoing)?
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide