What is the difference between GRP128 and GRP256 in GSR ?

I work in one of ISPs in korea.I want to know what is the difference between GRP128 and GRP256 in GSR( GIGABIT SWITCH ROUTER ). GRP is memory card in GSR. Any advice will be helped . Sincerely cho ___ UPDATED Posting Guidelines:

About accessing to a site

This is kornet,one of ISPs in korea with regard to accessing a site http://sql_ep_external.phi.com we are able to traceroute and ping to the site but can't open the site on the web. here is the result of traceroute from a source 168.126.62.187 C:\WINDOWStracert sql_ep_external.phi.com Tracing

About accessing to some sites

This is kornet in korea. The kornet is one of ISPs in our nation. Recently we have had difficulty in getting to some sites like www.chez.com,www.com,www.yahoo.co.uk www.blizard.com,www.polarismech.com. Mostly we have got lots of calls from the customers who use ADSL connection with source ip