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тАО12-11-2008 02:59 PM
тАО12-11-2008 02:59 PM
difference in how 5304/5406 and 2626/2810 forward its packets
All,
I have this strange issue that I can't find any good explanation for. Basically there seems to be some difference in how 5304/5406 and 2626/2810 forward its packets.
I have a setup with two Juniper routers and several ProCurve switches between. When I change management IP and def.gw to another subnet (I don't do routing on the switches) within the same VLAN of a 53/54 everything is fine. I reach my other router with no issues. But when I do the same trick on a 2510, 2626 or 2810 (i.e. adding another IP in same VLAN), I can't reach the other router. I have full connectivity and can reach the other switches in the same subnet. But not the def.gw.
This is actually a quite severe flaw, because there must be some issue with the forwarding database or the source/destination address.
Anyone else seen this?
I have this strange issue that I can't find any good explanation for. Basically there seems to be some difference in how 5304/5406 and 2626/2810 forward its packets.
I have a setup with two Juniper routers and several ProCurve switches between. When I change management IP and def.gw to another subnet (I don't do routing on the switches) within the same VLAN of a 53/54 everything is fine. I reach my other router with no issues. But when I do the same trick on a 2510, 2626 or 2810 (i.e. adding another IP in same VLAN), I can't reach the other router. I have full connectivity and can reach the other switches in the same subnet. But not the def.gw.
This is actually a quite severe flaw, because there must be some issue with the forwarding database or the source/destination address.
Anyone else seen this?
3 REPLIES 3
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тАО12-14-2008 12:27 PM
тАО12-14-2008 12:27 PM
Re: difference in how 5304/5406 and 2626/2810 forward its packets
If routing is disabled you need to set the primary vlan to the vlan you configured an IP address on and on which your default gateway should work.
Example:
ip default-gateway 1.1.1.254
vlan 1
name "DEFAULT_VLAN"
untagged 1-24
no ip address
exit
vlan 30
name "VLAN30"
tag 23,24
ip address 1.1.1.1 255.255.255.0
exit
primary-vlan 30
Have fun
Example:
ip default-gateway 1.1.1.254
vlan 1
name "DEFAULT_VLAN"
untagged 1-24
no ip address
exit
vlan 30
name "VLAN30"
tag 23,24
ip address 1.1.1.1 255.255.255.0
exit
primary-vlan 30
Have fun
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тАО12-14-2008 02:20 PM
тАО12-14-2008 02:20 PM
Re: difference in how 5304/5406 and 2626/2810 forward its packets
There must be something else. I have changed routers or default gateways several times, but this seems like a deadlock situation. The traffic seems to leave the MX router, but never returns. Typically the setup is like this:
[Router]--[5304]--[2626]--..--[Router]
So either the 2626 doesn't understand what comes from the Juniper router, or the traffic between the 2626 and the router is silently dropped by the 5304. I have tried rebooting and clearing arp etc.
[Router]--[5304]--[2626]--..--[Router]
So either the 2626 doesn't understand what comes from the Juniper router, or the traffic between the 2626 and the router is silently dropped by the 5304. I have tried rebooting and clearing arp etc.
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тАО12-14-2008 11:58 PM
тАО12-14-2008 11:58 PM
Re: difference in how 5304/5406 and 2626/2810 forward its packets
Just to clarify; the switch gets ARP for the router. I just can't ping it. (.2 is neighbor switch, .1 is router)
gn-xx-s1(vlan-99)# sho arp
IP ARP table
IP Address MAC Address Type Port
--------------- ----------------- ------- ----
10.20.26.1 001f12-8cf94c dynamic 23
10.20.26.2 001ffe-92a500 dynamic 23
gn-xx-s1(vlan-99)# sho arp
IP ARP table
IP Address MAC Address Type Port
--------------- ----------------- ------- ----
10.20.26.1 001f12-8cf94c dynamic 23
10.20.26.2 001ffe-92a500 dynamic 23
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