I don't think it's an MTU issue, as i'm running the NM-16 module for the switching function on the GNS3 simulator
From: Wouter Prins [mailto:[email protected]] Sent: Monday, 15 June 2009 12:54 AM To: Antonio Dee Hotmail Subject: Re: [OSL | CCIE_RS] Fallback Bridging creating problem with routing protocol MTU issue? 2009/6/13 Antonio Dee Hotmail <[email protected]> Hi All, I'm not sure if this is just because of GNS3 or this is really a problem with Fallback bridging to look out for. My fallback bridging configuration on Cat1 is: Cat1(config)# bridge 10 protocol vlan-bridge Cat1(config)# no bridge 10 acquire Cat1(config)# bridge 10 address 1111.1111.1111 forward Cat1(config)# bridge 10 address aaaa.aaaa.aaaa forward ! Cat1(config)# int vlan 5 Cat1(config-if)# bridge 10 ! Cat1(config)# int fa1/10 Cat1(config-if)# bridge 10 Nothing fancy, I'm just trying out scenarios integrating different things to see if they break or not. And i stumbled something that breaks :-) or :-( My setup is so simple: R10 <-------> Cat1 <------> R5 R10 (192.168.10.10) to Cat1 subnet is 192.168.10.0/24 - Cat1 connected to R10 with Fa1/10 port L3 configuration R5 (192.168.5.5) to Cat1 subnet is 192.168.5.0/24 - Cat1 connected to R5 with Fa1/5 port L2 configuration (vlan 5) ; SVI on Cat1 is 192.168.5.1 Everytime i stop my GNS3 and then start back from scratch, i get this error after injecting the fallback bridging on Cat1 to bridge both subnets. I get this error on R5 to Cat1 leg, i don't see this on R10 to Cat1 leg. It goes up and then goes down, it's flapping. Cat1(config)# *Mar 1 00:20:53.703: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.5.5 (Vlan5) is up: new adjacency Cat1(config)# *Mar 1 00:22:13.187: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.5.5 (Vlan5) is down: Interface Goodbye received Cat1(config)# *Mar 1 00:22:15.999: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.5.5 (Vlan5) is up: new adjacency Cat1(config)# *Mar 1 00:23:35.511: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.5.5 (Vlan5) is down: retry limit exceeded Cat1(config)# *Mar 1 00:23:38.131: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.5.5 (Vlan5) is down: Interface Goodbye received Cat1(config)# *Mar 1 00:23:41.563: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.5.5 (Vlan5) is up: new adjacency Cheers! Antonio -- Wouter Prins [email protected] 0x301FA912
