We have one primary and one redundant core 6509. The core 6509s are link together via the GBIC port on the supervisor cards. Each of our access layer 3500s have one link to each of the 6509s. HSRP is running between the core 6509s. Spanning tree is running throughout the network. Both of the core 6509s have the same 24 VLANs defined on their ports. All ports on the 3500s are members of whatever VLAN the link to the core 6509 is in. I am not able to view the configuration of the 6509s. I assume we are doing multilayer switching however.
I am wondering how traffic gets routed or switched between the core 6509s in the following scenario:
The redundant links on two 3500s are in blocking mode. Each 3500 is in a separate VLAN. The primary link on 3500 goes down causing its redundant link to go into forwarding mode. Another 3500 has a forwarding primary link and a blocked redundant link. Hosts patched into the two 3500s now need to communicate.
I dont see HSRP entering the picture since in this scenario there has not been a 6509 failure. I thought perhaps Multilayer switching was taking over. However, I read that MLS with multiple MLS-SEs and MLS-RPs in separate switch chassis is not supported.
Re: MLS w/ 2 MLS-RPs & MLS-SE's separate chassis?
There is no HSRP state change unless the 3500 is the transient switch for both 6509's to exchange HSRP hello's.
MLS (Sup1) or CEF (Sup2) is enabled by default on the 6509. The 3500XL switches do not support central rewrite and does not support MLS. The MLS/CEF flows on the 6509's would purge so that traffic can be switched to the new downstream link.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.